Many times the mother cleans the house and would like to clear out all the junk which children are want to hoard.
Another common situation is where the child brings home a danish and just leaves it with no intention, (or even with an intention to save it indefinitely).
May these items be treated as belongings of the household or is it to be treated as belonging to another person?
The halocho is that if someone gives a child a present and the child is under bar mitzvah and living at home it belongs to the parents. Also as long as a child lives at home and is supported by his parents his earnings and objects which he finds belong to the parents.
R’ Yosef Fleishman
Choshen Mishpot siman 270 seif 2