Praise be to Allaah.
You should give your father whatever will please him, provided that this does not affect your own interests and needs. As for your husband, he has nothing to do with your wealth that Allâh has given to you. The fact that your father wants to build a house for his second wife, who is your mothers co-wife, does not mean that you are not obliged to honour him, for the child and whatever he owns belong to the father. Yes, if there is a conflict between obedience to your mother and obedience to your father, then you must take a balanced approach, whilst giving precedence to your mother, because she takes priority when it comes to good companionship, and her rights are greater than those of the father. And Allâh is the source of strength.