Question:
Does the charity or gifts that a husband gives to his other wife’s family
affect his fairness between his wives?
Shaykh Ibn Baaz (may Allaah have mercy on him) said: That’s fine, there is no harm in it, inshaa Allaah. It
does not affect anything. The important thing is to treat them [i.e. his wives]
equally and fairly in their own right. However, if he gives [a gift] to the
family of one of his wives because of their poverty, or because of their
kindness to him, or for other reasons, then this has nothing to do with treating
his wives equally and fairly, and there is no harm in that. Yes.
Source: Fataawaa Noor alaa ad-Darb by Shaykh
Abdul-Azeez ibn Abdullaah ibn Baaz; translated by Abdus-Samee Abdus-Salaam