Hindu mythology is one of the more tricky topics to explain to children. A few years back, when I was narrating the vamana avatar to Hiranmayi:
Me: And so, Lord Vishnu as Vamana kept on foot on earth, another foot on heaven and the third on Mahabali’s head.
H: Amma, why did Vishnu ummaachi (God) not keep in Venus or Mercury or the other planets ?
He could have kept on them, there was space there…
It was the season of dashavatar story telling…
Me: You know all the avatars of Lord Vishnu now isnt it ?
H: Amma, that’s all fine. But I dont think Balarama is Vishnu ummaachi’s (God) avatar.
Me: Why ?
H: How can 2 avatars exist at the same time and how can Vishnu be his own brother ?