Her Secret
This is why it is not obligatory, such as treating them equally with regard to intercourse, that is in Al-Mughni, 7/232.
Al-Haafiz ibn Hajar said: If he gives each of them her rights with regard to clothing, spending and spending time with them, then it does not matter if his heart is inclined more towards one or if he gives one a gift… that is in Fath al-Baari, 9/391.