The younger sibling knows that it's her mom, too, so she runs in Mom's direction. Her big sister sees her and runs after her. Well, you said we had to get Mom's permission first. You can't just ask her out of the blue. You have to wait 'til she's in a good mood.
Timing is everything.
You can milk cows in the morning, and you can milk them in the evening. Timing is everything. And we learned when to milk our parents. Wait until they're in a good mood and then attack. So we do what we know works.