You have to laugh at 'em .
Niece and nephew...playing in the garden. Niece falls on grass (she's two), nephew shouts "pile on" (he's 7). Niece accidentally () kicks nephew in head. He gets into a paddy and a stone falls out of his pocket. My niece then picks that up and claims it for her own. Now my nephew won't speak to her and has been in apaddy for the last hour.
Next...niece walks up to him "What's up johnny?", nephew "You're not sleeping mine tonight", niece, jumping up and down shouts "Yes I am, yes I am, yes I am.." - now they're both in tears.