It’s the haq of a sister and a responsibility of a brother to take care of his siblings/family in the ways possible for him. Wives who interfere too much in these dealings are snatching credit points from the husbands.
If the guy’s wife and children suffer because he is unable to create a balance…let’s say he sends out so much that his wife and kids have to sacrifice repeatedly then there is a problem because they have haq too.
At the end of the day the burden falls on the man to create the right balance and know when to shut his ears from his wife’s or sister’s bickering.