I cant put my hear around why a father would gift a underaged kid a gun of any kind UNLESS the kid is going to the junior olympics of shooting or something.
Eh... the gun I own was actually given to me around 12-15 (I don't quite remember when, but it was before I was 16), iirc, but it was given after, y'know, actual safety training, and mostly because it was a family heirloom. Old (actual antique, i.e. it was built over a century ago) 22 a great-grandfather passed down, old enough the thing wasn't manufactured with a safety. It's how I identify it among the firearms in the family; mine's the one with no safety, heh.
Clearly not what was going on here in any way, shape, or form, but yeah, there's some small subset of reasonable actions that involve gifting a firearm to someone young. You're just supposed to keep an eye on it and whatnot until they're older, and have better sense about it than... apparently anyone involved in the situation in question.