Create a family with 10 kids (you decide their gender). You have free reign... except you can use each letter of the alphabet only once as the first letter of a name, including the parents' names. The family's surname must be hyphenated and those two letters you can't use again either.
Hope this makes sense!
Here's the alphabet if you want to copy and paste it to help keep track of the letters you've used:
a b c d e f g h i j k l m n o p q r s t u v w x y z