Hi! a word from the same family of client (customer) could be clientèle (customer base)!
a word from the same family is basically a word who takes the same idea as your first word! try not to confuse it with synonyms!
1. Quelle
2. Quel
3. Quels
4. Quelles
5. Quel
6. cette
you do it dependent on whether the thing you are talking about is masuline or feminine
I'm pretty sure it's attendez
