Ouch! That stings the soul. I am sorry to hear that this is how it ended up, 2door.
What a sad outcome. I agree with your decision to keep the bike after you rebuild it. It sounds like your nephew has no real appreciation for what it is and what proper care and maintenance are.
I am not going to comment on the youth of today, only agree fully with what everyone else has posted concerning the subject.
I wish you the best of fortune with the rebuild, and who knows..... perhaps someone else may come along in your life that will fit the bike ( you said it was too small for you) and respect it as well. Everything happens for a reason, good or bad.