He wants to do Hajj first and his father wants him to get married first
Question

                Will I be disobeying my father because of the following? 

1.  My father (may Allah have mercy on him) wanted me to start looking to get married, but I refused because I wanted to complete my postgraduate studies.

2.  The money that I saved was sufficient to get married (the marriage contract only). Please note that I have a job.

3.  Then I was not able to travel in order to complete my postgraduate studies, so I decided to start a small business in the hope that I could earn some money with which to do Hajj. This project was a partnership between me and him; it was a piece of land (the price of which was not enough to do Hajj). We were planning to change the house in which we live because of the annoyance caused by the neighbours, may Allah guide them.

4.  My father refused to do Hajj  with this money because he said that it was my money, not his.

5.  After a discussion which did not lead anywhere, I said: I am going to do Hajj, but he told me to get married first.

6. Now – after he died in Ramadan – they are asking me to do what he wanted me to do, but I am telling them that I want to do Hajj first.

7. The land is now yielding enough money to perform the obligatory Hajj; he and I paid off the debt (the price of the land) before he died.
Praise be to Allah.
    Firstly: 

    Hajj is obligatory and should be done at the earliest 
    opportunity according to the more correct of the two scholarly opinions. 
    This has been discussed in the answer to question no.
    41702. 

    If the available money is sufficient for either doing Hajj or 
    getting married, then precedence should be given to marriage if there is a 
    need for that and there is the fear of falling into haraam. If there is no 
    (urgent) need for marriage, then Hajj should be given precedence. 

    Ibn Qudaamah (may Allah have mercy on him) said in 
    al-Mughni (5/12): If (the individual) needs to get married and fears 
    that he may encounter hardship, then he should give precedence to marriage, 
    because it is obligatory in his case and he cannot do without it, so it is 
    like spending on his maintenance. If there is no such fear, he should give 
    precedence to Hajj, because marriage is voluntary and should not be given 
    precedence over the obligatory Hajj. End quote. 

    Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) was 
    asked: Is it permissible to delay Hajj until after getting married for one 
    who is able to do it? That is because of what the youth are facing nowadays 
    of temptation, both great and small. 

    He replied: 

    There is no doubt that marriage, for one who has the desire 
    and urgent need for it, takes precedence over Hajj, because if an individual 
    has overwhelming desire, in that case marriage becomes one of the 
    necessities of life, like eating and drinking. Hence it is permissible for 
    one who needs to get married and does not have any money to be given zakaah 
    funds with which to get married, just as the poor person may be given food 
    to suffice him and clothes with which to cover his ‘awrah out of the zakaah 
    funds. 

    Based on that, we say: if he needs to get married, then he 
    should give marriage precedence over Hajj, because Allah, may He be 
    glorified and exalted, stipulated that in order for Hajj to be obligatory, 
    one must be able to do it, as He says (interpretation of the meaning):

    “And Hajj 
    (pilgrimage to Makkah) to the House (Ka‘bah) is a duty that mankind owes to 
    Allah, those who can afford the expenses (for one’s conveyance, provision 
    and residence)”

    [Aal ‘Imraan 3:97].

    In the case of one who is young and it does not matter for 
    him whether he gets married this year or next year, then he should give 
    precedence to Hajj because it is not necessary for him to give precedence to 
    marriage.

    End quote from Fataawa Manaar al-Islam, 2/375 

    Based on that, if you do not have any fears (of falling into 
    haraam) if you delay marriage, then you should hasten to do Hajj first, and 
    Allah will compensate you with good, because Hajj is one of the important 
    obligatory duties and rituals of Islam. 

    You do not have to carry out your father’s wishes with regard 
    to this matter, either during his lifetime or after his death, because that 
    would result in your delaying Hajj when there is no need to do so. 

    Secondly: 

    You should have tried to please your father by giving 
    precedence to marriage over completing your postgraduate studies. It was 
    narrated from Imam Ahmad (may Allah have mercy on him) that marriage is 
    obligatory if either of the parents tell you to get married. 

    Al-Mirdaawi said: Is it (marriage) obligatory if the parents, 
    or one of them, tell the son to get married? Imam Ahmad (may Allah have 
    mercy on him) said: If he has parents who are telling him to get married, 
    then I tell him to get married. Or if he is a young man who fears that he 
    may commit sin, I tell him to get married. 

    By saying this, he made the parents’ instructions to get 
    married equivalent to fearing that one may commit sin.

    End quote from al-Insaaf, 8/14 

    Thirdly: 

    There is nothing wrong with a father doing Hajj with his 
    son’s wealth; in fact there is nothing wrong with a person doing Hajj with 
    another person’s wealth in general. But if a person was not able to do the 
    obligatory Hajj because he could not afford the expenses, then he became 
    able to afford it if someone else pays for it, does he have to accept this 
    money in order to do Hajj? There is a difference of opinion among the 
    fuqaha’ concerning that. 

    Ibn Qudaamah (may Allah have mercy on him) said: He is not 
    obliged to do Hajj if someone else spends on it, and he does not become able 
    to do it thereby (and thus it does not become obligatory for him), whether 
    the one who gives him the money is a relative or otherwise, and whether he 
    gives him a means of transportation and provisions, or he gives him money. 
    However, it was narrated from ash-Shaafa‘i that if a person’s son gives him 
    money that enables him to do Hajj, then he is obliged to do it, because he 
    has enabled him to do Hajj without feeling that he owes a favour to anyone, 
    and no harm or annoyance will result from that. Therefore he is obliged to 
    do Hajj, as would be the case if he possessed sufficient provisions and a 
    mount. 

    In our view, the words of the Prophet (blessings and peace of 
    Allah be upon him) make Hajj binding on one who has a means of 
    transportation and sufficient funds to cover the costs of the journey. 
    However, in the case where someone else offers to over these costs, he is 
    not regarded as having the means or the money to obtain the means, so Hajj 
    is not obligatory for him. The same applies if his father offers to help 
    him, because we do not think that the father will not feel that he owes him 
    a favour in this case. 

    End quote from al-Mughni, 3/87 

    To sum up: it is obligatory for you to hasten to do Hajj, so 
    long as you do not think that you will fall into haraam as a result of 
    delaying marriage, and you should ask Allah, may He be exalted, for 
    forgiveness for having gone against your father’s instructions when he told 
    you to get married first. 

    We ask Allah to help and guide you. 

    And Allah knows best.