The Juniper Tree

The Juniper Tree employs a common motif found in fairy tales: the transformation of a human into an animal (in this case a bird). However, The Juniper Tree also includes the transformation of the bird back into human form, which is an aspect that not all fairy tale transformations include. Leading up to this, a boy is killed by his stepmother, who then tries to blame her daughter and makes her swear not to tell anyone. Doing what any person trying to hide a dead body would do, the stepmother chops up the boy and makes a stew out of it for the father to eat. The daughter, Marlene, then buries the boy's bones beneath a juniper tree. At this moment, the tree starts moving to and fro and, with a puff of smoke, a bird flies out of the tree. The bird then enchants a goldsmith, a shoemaker, and a miller with his beautiful song recounting his (the boy's) death and receives a gold chain, a pair of red shoes, and a millstone. Upon receiving his prizes, the bird flies back and sings the same song to his family, all of whom are enchanted by it except for the stepmother. Each member of the family comes out one at a time to hear the song, which prompts the bird to give the gold chain to the father and the shoes to the daughter. Once the stepmother comes out, the bird graciously gives her the millstone, which comes crashing down on her and killing her. The boy then appeared at the site of the boulder impact and the family, like any good fairy tale family, does not question the events and goes back inside to eat together happily.

I think that Son 2.0 is primarily human, but his animal side can't be discounted either. Unlike other fairy tales where a human is changed into an animal and changed back, this character was killed (pretty definitively at that unless decapitations aren't a surefire way of killing someone anymore) and then resurrected as a bird. It's not that it would be illogical for this new son to be entirely human because logic doesn't really have a place in fairy tales. Rather, the fact that Son 2.0 originally came from a bird and not his first human form can't be ignored.

His song and his plot to gather the items necessary to lure out his family and kill his stepmother further suggest that Son 2.0 are primarily human. It is not entirely implausible to give higher reasoning skills to an animal in a fairy tale, but it is more of a human characteristic considering how many fairy tales assert that humans are better than animals.

Son 2.0 can come back from the dead for the exact same reason the bird can sing a song that its listeners can not only understand, but be enchanted by; for the same reason that the same bird can carry a milestone big enough to crush a woman; for the same reason that the juniper tree can clap its branches together and produce a flame and smoke without erupting in flames itself:

...it's a fairy tale, anything is possible.