Is adoption permissible in Islam?

Answer

While it is permissible to adopt children, it entails considerable responsibility and brings in its wake practical difficulties. If the child is a girl, then even before she becomes a baalighah, she will have to adopt purdah for the foster father. The same will apply to a boy and his foster mother.

A great problem will be if the couple have children of their own. There will be purdah between the adopted boy and the daughter of the adoptive parents. With them all living in the same house, this will be extremely difficult.