All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.
We have previously underlined that the husband is commanded to provide for his wife and children according to his ability and that the wife is not required to provide for herself or her children unless she willingly chooses to do so. The wife’s earnings are her personal property and it is incumbent on the husband to maintain his wife and children. A husband may help his parents financially out of dutifulness to them with what exceeds the maintenance needed by his wife and children. Please, refer to Fataawa 82987 and 168559 which underline that the financial rights of the wife and children should be given precedence to the rights of others.
If the wife (willingly) chooses to contribute financially to the household expenses and meeting the family’s needs, her kindness should be rewarded with similar kindness on part of the husband. This is the disposition of the generous and honorable. Thus, Allaah, The Most Generous, The Exalted, rewards the charitable and good-doers with Paradise. He says (what means): {Is the reward for good [anything] but good?}[Quran 55:60]
In any case, the husband should not burden himself with helping his sister and her children or his brother financially if he cannot afford it. Allaah, The Exalted, says (what means): {... Allaah does not charge a soul except [according to] what He has given it. Allaah will bring about, after hardship, ease.}[Quran 65:7]
Based on that, you are entitled to abstain from providing for the family and require your husband to provide for you and your children, even if you would have to refer the case to the concerned authorities responsible for addressing Muslims’ disputes. However, you are advised to adhere to patience and reach a mutual understanding with your husband so that the problem does not escalate and incur discord and dissension and eventually lead to divorce. Your children would be the victims in such a case.
Allaah Knows best.