You know what I mean ... when they do something **so** nice that you nearly start to blub !!
The other day Angharad had gone out and I was joking with the kids that with mum gone, they could have a pint of beer with me if they wanted (to see what they would say).
Liam (7) told me in an earnest voice "dad, I don't think I'm old enough to drink beer yet. I think I have to be 16" (16 = grown up to him for everything ... he's already sussing out how old he needs to be to drive).
Well, I told him how I was proud he was so sensible and wasn't afraid to stand up and say "no" and that I was really looking forward to when he was old enough to take me out and buy me a pint of beer (ok, father-son moment ... I was getting emotional already)
He disappears and reappears a minute later with some money he still had left from his birthday saying "Dad ! I don't know how much beer costs but I might have enough to buy you one now !" (offering me his money)
God, I nearly burst into tears !!