Their brother wants to get married, so who is obligated to help him with the expenses, given that he has helped one of his brothers before and their father has passed away?

Question:
We are four brothers living with our mother in one house. Our father has passed away. Before he passed, he married two of us, and the other two have remained unmarried until now due to the poor economic situation and the high prices. One of the two, or one of the others who is married, went to work abroad and returned with a sum of money. He told his other brother, "Take this amount and get married with it, and I will postpone my marriage for now." This actually happened. After a number of years, the fourth brother asked us to help him get married, but unfortunately, the amount he has is not enough to cover the costs of the marriage. The question here is: who helps the fourth brother financially with his marriage? The three brothers who live with him in the same house, or the brother who recently got married and to whom his brother gave the money? Please advise us. May Allah reward you with good.

Answer:
In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, Lord of the worlds, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and all his Companions. To proceed: It is obligatory for a father to marry his sons if they are unable to marry with their own means, because this is part of the financial maintenance that is obligatory upon him. So, if he marries any of them during his lifetime, this is considered an obligation upon the father, following the obligatory maintenance he owes his sons. As for after his death, each son provides for himself, either from his inheritance if he has an inheritance from his father, or from his earnings. He has no obligatory right upon his brothers. If he is seeking to earn a living, has no money, and there is a fear of fitnah (trial, discord or temptation) for him, then it is obligatory for the one upon whom his maintenance is obligatory to marry him to protect his chastity. However, if he has money from inheritance or earnings, or if he is able to earn and obtain the cost of marriage and other things, then it is not obligatory for his brothers or his kin. As for the matter of volunteering and doing good, that is a different case.