I don't know that someone who's barely seven can be expected to have an informed opinion that would be worth adding as an appendix. It might be cute, or interesting to learn about child development to see what they would answer at 7yo, or fun to have them read it back five years later, but not to inform your decision by all that much. Figuring out what's in their best interest is what a parent chose to dedicate their life to imo; it's the parent's/parents' responsibility to think for them, not to use their fanciful answers to prove a predictable point

Given the quote, though, it does sound like the parent is not putting the kid's best interests first and foremost