I don't what to say but

Awwwwwwww! *sniff tear sniff*

This is awesome. A really touching story and you can feel what Neville feels as to not having parents, even though they still exist. I adore it :D

I think it's strange that even if you know a person is connected to you intimately that it is hard to find love for them without reason... or rather if you have reason to find that 'I don't have to, but I do'. Guilt for not loving them unconditionally... i hope you explore this more.