How can he enjoin what is good and forbid what is evil with regard to his father who is older than him?
Question

                As a young Muslim (26yrs) im often challenged with enjoining good and forbidding the wrong with poeple much older than me, especially my father who is muslim(from Egypt),how do I do this when he acts unjust with the way he talks to me,my brothers and my mother,not spending or teaching that much for thier deen ,whilst they go extreamly astray ,seeing my father shaking hands or hugging wemon at work for business puposses as he says not to make them feel uncomfortable or think weird,,,or as a youth leader for a youth group ,the parents will some times tell the children in my group while we are having a meeting to do something wich is a bida' in front of me,,how do I correct things like this in my position with out seeming disrespectfull to my elders.
Praise be to Allah.
    Enjoining what is good and forbidding what is evil is one of 
    the greatest duties that Islam enjoins upon Muslims; Allaah has made it the 
    main quality of this ummah and a condition of it being the best of people. 
    Allaah says (interpretation of the meaning): 

    “You (true believers in Islamic Monotheism, and real 
    followers of Prophet Muhammad and his Sunnah) are the best of peoples ever 
    raised up for mankind; you enjoin Al-Ma‘roof (i.e. Islamic Monotheism and 
    all that Islam has ordained) and forbid Al‑Munkar (polytheism, disbelief and 
    all that Islam has forbidden), and you believe in Allaah”

    [Aal ‘Imraan 3:110] 

    “The believers, men and women, are Awliyaa’ (helpers, 
    supporters, friends, protectors) of one another; they enjoin (on the people) 
    Al‑Ma‘roof (i.e. Islamic Monotheism and all that Islam orders one to do), 
    and forbid (people) from Al‑Munkar (i.e. polytheism and disbelief of all 
    kinds, and all that Islam has forbidden); they perform As-Salaah 
    (Iqaamat-as-Salaah), and give the Zakaah, and obey Allaah and His Messenger. 
    Allaah will have His Mercy on them. Surely, Allaah is All-Mighty, All-Wise”

    [al-Tawbah 9:71]
See also question no.
    11403. This is 
    indicative of the high status that Islam gives to enjoining what is good and 
    forbidding what is evil. 

    With regard to the problems of undertaking this duty with 
    regard to those who are older than you, especially your father, you can 
    overcome these problems to a great extent by understanding that this duty 
    must be accompanied by three basic characteristics: knowledge, kindness and 
    patience. Shaykh al-Islam Ibn Taymiyah said: “These three are essential: 
    knowledge, kindness and patience: knowledge before enjoining or forbidding, 
    kindness when doing so and patience afterwards, as it was narrated that one 
    of the salaf said: No one can enjoin what is good or forbid what is evil 
    unless he understands what he is enjoining or forbidding, and is kind in 
    enjoining and kind in forbidding, and is patience and forbearing when 
    enjoining and when forbidding.” 

    Majmoo’ al-Fataawa, 28/137 
In order to solve these 
    problems we should first draw attention to the importance of being patient 
    and forbearing. Do not be too harsh with your father, because he is first of 
    all your father, and because he is older than you. Seek help in doing that 
    by choosing the right time for each conversation, watching out for times 
    when he is in a good mood and is more likely to be influenced and respond. 
    Also seek the help of wise, righteous and sincere people. Before all that it 
    is essential to be sincere towards him in word and deed, and in all your 
    affairs, and to fear that the punishment of his Lord may befall him, and 
    after that be patient in awaiting the decree of your Lord. Whatever happens 
    to you if you do this duty for the sake of Allaah, as Luqmaan the wise said 
    to his son: 
“O my son! 
    Aqim‑is‑Salaah (perform As‑Salaah), enjoin (on people) Al‑Ma‘roof  (Islamic 
    Monotheism and all that is good), and forbid (people) from Al‑Munkar (i.e. 
    disbelief in the Oneness of Allaah, polytheism of all kinds and all that is 
    evil and bad), and bear with patience whatever befalls you. Verily, these 
    are some of the important commandments (ordered by Allaah with no 
    exemption)”

    [Luqmaan 31:17 – interpretation of the meaning]

    You should always remember the Close Friend of the Most 
    Merciful, Ibraaheem, and how he addressed his father when he told him not to 
    associate others with Allaah, which is worse than the things that your 
    father is doing; how he was loving towards him, felt pity for him and was 
    sincere towards him, then he bore his bad response with patience. Allaah 
    says (interpretation of the meaning): 
“And mention in the Book 
    (the Qur’aan) Ibraaheem (Abraham). Verily, he was a man of truth, a Prophet.
42. When he said to his 
    father: ‘O my father! Why do you worship that which hears not, sees not and 
    cannot avail you in anything?
43. ‘O my father! 
    Verily, there has come to me of the knowledge that which came not unto you. 
    So follow me, I will guide you to the Straight Path.
44. ‘O my father! 
    Worship not Shaytaan (Satan). Verily, Shaytaan (Satan) has been a rebel 
    against the Most Gracious (Allaah).
45. ‘O my father! 
    Verily, I fear lest a torment from the Most Gracious (Allaah) should 
    overtake you, so that you become a companion of Shaytaan (Satan) (in the 
    Hell‑fire).’ 
46. He (the father) 
    said: ‘Do you reject my gods, O Ibraaheem (Abraham)? If you stop not (this), 
    I will indeed stone you. So get away from me safely (before I punish you).’
47. Ibraaheem (Abraham) 
    said: ‘Peace be on you! I will ask forgiveness of my Lord for you. Verily, 
    He is unto me Ever Most Gracious.
48. ‘And I shall turn 
    away from you and from those whom you invoke besides Allaah. And I shall 
    call upon my Lord and I hope that I shall not be unblest in my invocation to 
    my Lord’”
[Maryam 19:41-48] 

    With regard to the group that you are leading, this is an 
    easier matter, because their closeness in age makes it easier for them to 
    accept advice from you, especially if they know you to be sincere and 
    honest, and that you practise what you preach. This practical implementation 
    of what you are calling them to is one of the most effective means of 
    da’wah, especially if speaking directly will cause them to turn away and be 
    stubborn. 

    With regard to your advice and da’wah being undermined by 
    their parents’ directions, you should avoid blatantly contradicting what 
    they say; rather you should look at the mistakes and teach them the right 
    way. If it is the matter of a sin that they are committing, then teach them 
    to fear disobeying Allaah and to love obeying Him. Instill in their hearts a 
    sense of the greatness of Allaah and the seriousness of His prohibitions, 
    then teach them about what has been narrated concerning these particular 
    sins. This is what you should do if it is the matter of an innovation that 
    you notice them engaging in. First instill in their hearts the love of the 
    Sunnah of the Prophet  (peace and blessings of Allaah be upon him) and 
    teach them that this is the practical manifestation of love for the Prophet 
     (peace and blessings of Allaah be upon him). And instill in their 
    hearts a hatred for bid’ah and tell them how it is the way that leads to 
    Hell even though the one who follows it thinks that it is the way that leads 
    to Paradise. Tell them of the advice of the Prophet  (peace and 
    blessings of Allaah be upon him) to his ummah concerning that, as narrated 
    in the hadeeth of al-‘Irbaad ibn Saariyah (may Allaah be pleased with him) 
    who said: 

    “The Messenger of Allaah  (peace and blessings of Allaah 
    be upon him) led us in praying Fajr then he turned to us and delivered an 
    eloquent exhortation that caused our eyes to flow with tears and our hearts 
    to melt. We said (or they said): ‘O Messenger of Allaah, it is as if this 
    exhortation is a farewell, so advise us.’ He said: ‘I advise you to fear 
    Allaah and to listen and obey even if (your leader is) an Abyssinian slave. 
    Those of you who live will see great differences after I am gone, so I urge 
    you to adhere to my Sunnah and the path of the Rightly-Guided Caliphs, and 
    take hold of it firmly. And beware of newly-invented matters, for every 
    newly-invented matter is an innovation and every innovation is a going 
    astray.’” Narrated by Ahmad, 16692 and others; classed as saheeh by 
    al-Albaani in al-Saheehah, 45. 

    So after this general advice we move to addressing the 
    specific bid’ah into which they have fallen. 

    It should be noted that your presence in this group should be 
    for a good purpose; as long as your presence is more likely to do good or to 
    reduce any evils, then join them in their gatherings with this intention. 
    But beware of letting your presence have any negative effect or make you get 
    used to accepting mistakes, or lead you to make similar mistakes. In that 
    case you should leave the place where evil things are happening. Allaah says 
    (interpretation of the meaning): 

    “And it has already been revealed to you in the Book (this 
    Qur’aan) that when you hear the Verses of Allaah being denied and mocked at, 
    then sit not with them, until they engage in a talk other than that; (but if 
    you stayed with them) certainly in that case you would be like them. Surely, 
    Allaah will collect the hypocrites and disbelievers all together in Hell”

    [al-Nisa’ 4:140]
Shaykh Ibn Sa’di (may 
    Allaah have mercy on him) said: Whoever attends a gathering in which Allaah 
    is disobeyed, then he must denounce their action if he is able to, or he 
    must leave if he not able to do that.

    Tafseer Ibn Sa’di, p. 210. 

    May Allaah help us and you to do that which He loves and 
    which pleases Him, and make us steadfast in adhering to true guidance and 
    the straight path.