If this is the case, and this brother consumed your wealth unlawfully, then there is no sin on you if you take his share of this house and do not give it to him, if his share of the house is equivalent to your dues or less. But if it is more than what was rightfully yours, then take what you are entitled to and give him the rest.
The faqeeh Muhammad ibn ‘Abd-Allaah al-Kharashi al-Maaliki (may Allaah have mercy on him) said:
This issue is known as opportunism. What is meant is that if what is a person’s lawful right is being kept by someone else, and he gets the opportunity to take it or take what is equal to his right from the wealth of that other person, then it is permissible for him to take that from him, whether it is from the same type of wealth or something else, according to the well known view, and whether the other person is aware of that or not; and he does not have to refer the matter to the judge.
The permissibility of taking it depends upon two conditions:
1 – That his right should not be in the form of a punishment (‘uqoobah), otherwise it is essential to refer the matter to the judge. The same applies to hadd punishments. No one can impose them except the judge.
2 – That there should be no risk of fitnah (trouble, turmoil) because of him taking what is rightfully his, such as fighting or bloodshed, and that there should be no risk of being accused of crime as a result, such as robbery and the like. If there is no guarantee that that will not happen, then it is not permissible for him to take it. End quote.
Sharh Mukhtasar Khaleel (7/235).
Al-‘Izz ibn ‘Abd al-Salaam (may Allaah have mercy on him) said:
If a person is able to get something like that which is rightfully his from the wealth of one who has wronged him, then he may take it … and if it is not the same type of wealth as what was taken from him, it is permissible for him to take it and sell it, then regain what is rightfully his with the money. End quote.
Qawaa’id al-Ahkaam (2/176).
Shaykh Ibn Jibreen (may Allaah preserve him) was asked: We have a servant, and my father does not pay this servant her salary. Can I take something from his wealth without his knowledge and give it to the servant, knowing that he can afford it?
He may have done this for fear that she may run away and the like, or he wants to keep it for her so that he can pay it all to her in one go when she leaves, because she does not need it at the moment. You have to find out about the reason why he is withholding it. It is well known that it is haraam to delay paying a hired worker. It is narrated in the hadeeth: “Give the hired worker his wages before his sweat dries.” There is also a stern warning concerning the three whom Allaah will punish, one of whom is “a man who hired a worker and he did the work, but he did not pay him his wages.”
If you think that he is not going to pay her, and is withholding it from her, and he does not want what is best for her, then you have to give her her wages from his wealth, even if he does not know about that. End quote.
Sharh Akhsar al-Mukhtarasaat ‘ala al-Shaamilah by Shaykh Ibn Jibreen
See also the answer to question no. 27068.
Similarly, you do not have to pay his share to his first wife and his children, because the wealth is your brother’s and you have a right to it. But if you give this money to them, or some of it, that is an act of kindness and charity on your part towards them, and Allaah will reward those who give charity.
And Allaah knows best.