You are right that during the month of Ramadan, the work of women in the house increases a lot, especially those who are mothers, because every mother gets extra time to take care of their children and they need to cook something extra for iftar or for the siyari. Also, during our fasting, we have to spend our days eating different types of healthy food. We must be engaged in extra work to arrange those foods. Also, you have prepared your sister's children's favorite food.