I like moments like this where he just gets to relive being a kid and having a good mother. No matter how old we get, I think we all go to that time in our childhood when no matter what we could count on the unconditional support of our parents (or experience that at least once if we haven’t gotten it). The best part of these reincarnation stories is that these people who reached the end of their lives can experience the warmest and most loving part (or what should be). Plus he’s still IN a child’s body. I think these stories forget, but just having the memories of an adult doesn’t make you one. There are certain physical developments you still have to go through and certain instinctive traits children still have to enhance their early development. Imagine something like an illogically seeing his mom’s opinion (obvious lie) above everyone else’s has something to with that (maybe; idk. I’m not a scientist. Sounds like it makes sense though).