That curly hair in the neck :) When my daughter was a bit younger than your kids she had the white hair that is so common here in Denmark, and from ear to ear she had this curly bush, but on top all the hair was straight. So my wife cut off the curls as she was afraid it looked like a clowns hair.
Regretting of course the moment she had done it... :)
Oh dear. My daughters hair took forever to grow just to this length.