Pray for your husband’s family. Ask God to bless them. Pray that your husband will be a blessing to his family and ask that God will give him wisdom so that he knows where to draw the line.
Your husband’s family is important to him. They are a part of his life and have a strong influence on him. He has a duty towards them and he needs to honour them.
It does not matter whether your husband’s family is the loving and nurturing type or if they are opportunists. ..it is his duty to do what he can for them.
HOWEVER some families use charms and diabolic means to manipulate. Ask God to fortify your husband so that when he fulfills his duties it will not be at the expense of his wife and children’s well-being.
This is a tricky issue but it’s also an important one and it takes wisdom from God. He can be a good son and brother and still be a good husband and father.