Is the husband religiously entitled to blame his wife for her family or prevent her from visiting them due to her mother's previous work in a usurious bank, given that the mother is regretful and the father's work is permissible, especially since the husband repeats these words in front of the children and prevents the wife from staying with her family?

The husband has no right to blame his wife for some of her family's money being from usury, because no one bears the sin of another, and sincere repentance erases what came before it. If the father's money is lawful, there is no reason for the husband to prevent his wife or children from visiting her family, as the preponderant opinion is that dealing with someone whose money is mixed is permissible if the unlawful portion does not predominate. It is not permissible to sever ties of kinship for this reason, because maintaining kinship ties is obligatory, and severing them is forbidden and one of the major sins.