Because my mum says things like:
"DS1's hair could do with a cut."
"Don't you think it's time DS2 stopped pretending to be a monkey all the time now he's 8?"
"DD really needs some new clothes! She can't wear jeans all the time."
"Darling you dooo look tired!"
and the classic....
"Children do need their mothers at home of course" 
And my aunt my aunt says things like:
"I don't know how you do it, my love! Working full-time with 3 children. You are a wonder!"
She is like a breath of fresh air. In fact I may ask her to move in with me so she can tell how wonderful I am all the time.