Gray Hair

A young child walked up to her mother and stared at her hair. As mother scrubbed on the dishes, the girl cleared her throat and sweetly asked; "Why do you have some grey strands in your hair?"
The mother paused and looked at her daughter. "Every time you disobey, I get one strand of grey hair. If you want me to stay pretty, you better obey."
The mother quickly returned to her task of washing dishes. The little girl stood there thinking. She cleared her throat again. "Mother?" She sweetly asked again.
"Yes?" Her Mother replied. "Why is Grandma's hair all grey?"