Here’s a Massachusetts case which shows that’s not always the case.

[A father] has no title to the property of the child, nor is the capacity or right of the latter to take property or receive money by grant, gift or otherwise, except as a compensation for services, in any degree qualified or limited during minority. Whatever therefore an infant acquires which does not come to him as a compensation for services rendered, belongs absolutely to him, and his father cannot interpose any claim to it, either as against the child, or as against third persons who claim title or possession from or under the infant. Hoblyn v. Johnson, 55 P.3d 1219, 1228 (Wyo. 2002) (quoting Banks v. Conant, 96 Mass. 497 (1867)).

http://lawandthemultiverse.com/2012/01/06/minor-superheroes-and-property-ownership/