What if Timmy had an older sister?

Can you imagine if Timmy had an older sister who was Vicky’s age but she would be so inattentive like her parents to her little brother she wouldn’t be able to babysit Timmy but while at school she’d be always the bane to Vicky that’s why Vicky is always the way she is to Timmy because Vicky is jealous of Timmy’s sisters popularity.