Is the husband sinful for not providing housing and maintenance for his working wife who agrees to that? What is the ruling on a spousal agreement not to have children by mutual consent? And is she sinful for waiving her share of the inheritance in favor of her husband's children?

Housing and maintenance are rights of the wife, and if she relinquishes them willingly, there is no sin upon the husband. Bearing offspring is one of the most important objectives of marriage, and it should not be missed. However, there is no harm if the spouses agree to forego it. The wife's share in inheritance is due to her after the death of the husband, and her relinquishing it before that is of no validity.