She wants to help her fiancé with regard to marriage but her siblings say no
Question

                I am a young woman aged 23 and am engaged. I was to help my fiancé with the requirements of marriage so that we can get married as soon as possible, because he is not well off, but my sisters do not agree. Please note that I will pay with my own money. Is that permissible, or does he have to provide everything?.
Praise be to Allah.You have 
    done well in your intention to help your fiancé so that he can get married 
    to you. This is something for which you should be thanked, and it is 
    indicative of strong religious commitment and deep wisdom. 
Your helping 
    your fiancé to go ahead with the marriage is helping him with his religious 
    commitment and faith, and this is one of the greatest acts of worship, and 
    is something that is regarded as praiseworthy in Islam. It is one of the 
    best ways of spending one’s money. 
It was 
    narrated that Thawbaan said: When the verse “And 
    those who hoard up gold and silver” [al-Tawbah 9:34] 
    was revealed, we were with the Prophet  (peace and blessings of Allaah 
    be upon him) on one of his journeys. One of his companions said: This has 
    been revealed concerning gold and silver; if we knew of any better kind of 
    wealth we would acquire it. He said: “The best of it is a tongue that 
    remembers Allaah, a heart that is grateful and a believing wife who will 
    help him with his faith.” Narrated by al-Tirmidhi (3094) and Ibn Maajah 
    (1856). In Ibn Maajah’s report it says: “who will help one of you with 
    regard to the Hereafter.” The hadeeth was classed as hasan by al-Tirmidhi 
    and as saheeh by al-Albaani in Saheeh al-Tirmidhi. 
Shaykh 
    al-Mubaarakfoori (may Allaah have mercy on him) said: 
“A believing 
    wife who will help him with his faith” means with his religious commitment, 
    by reminding him to pray and fast and to do other acts of worship, and will 
    prevent him from committing zina and other haraam deeds. 
Tuhfat 
    al-Ahwadhi (8/390) 
Undoubtedly 
    marriage helps a man to obey Allaah and keeps him away from haraam things 
    such as looking and listening, and protects him from falling into zina. 
This is in 
    general terms, but you should pay attention to some things, including the 
    following: 

    1-The man’s seriousness with 
    regard to marriage and how hard is is striving to meet the requirements of 
    marriage. Because some people depend on the help of others and are not 
    serious about doing what is required of them.

    2-If your fiancé is serious and 
    he can afford some of the expenses of marriage but not all of them, there is 
    nothing wrong with your helping him with some of what he needs, such as the 
    wife buying some of the furniture and household equipment, or paying for 
    some of the wedding expenses.

    3-The fiancé is a “stranger” 
    (non-mahram) to his fiancée until the marriage contract is done, so during 
    the engagement period it is not permissible for him to be alone with her, 
    shake hands with her or go out with her, rather he is like any other 
    stranger. See question no. 
    2572.
We ask 
    Allaah to help you both to do that which He loves and which pleases Him, and 
    to bless you with good offspring. 
And Allaah 
    knows best.