Aruch HaShulchan, Laws of Tzedakah 251:2

This is the language of the Rambam and the Tur and the Shulchan Aruch: One gives to their adult sons and daughters, even if one is not obligated to feed them, in order to teach them Torah and train them to act in a righteous manner. And similarly, if one gives a present to their parents and they need [the gift], this is in the category of tzedakah. Furthermore, one must prioritize their parents over other people, and this is true for [prioritizing] other relatives as well. Even if [the relative] is not your child, nor are you their parent, but just another relative, you must prioritize them before any other person. And your sibling from your father’s side precedes your sibling from your mother, and the poor of your house precede the poor of your city, and the poor of your city precede the poor of another city - until here are their words. And the poor of your city are those who reside in your city. Those poor who come to your city from another city - they are considered the poor of another city even though they are currently with you, but many disagree with this. [Translation by AJWS]