Ferncloud
1. Discuss with her how odd that all her currently living kits are toms.
2. Every time you walk by her mutter that there is no more space in the den any more due to all the new kits.
3. When Dustpelt and Ferncloud are beside each other ask Dustpelt how old he is, then ask Ferncloud how old she is. Look at them in a disgusted way and run off, giving dirty looks back at them. (But really, they're too damn old.)