Board Thread:Wiki Discussion/@comment-32744161-20180104184342/@comment-47205-20180104195354

There are most likely many families with a small number of species in them. That is because there is a lack of creatures on the wiki which can go in them. There are also perfectly good families with lots of species in them.

If you don't feel like Apodidae is suitable for your creations then that's fine (although that's because you've used the same genus for several extremely different species; no single family will be suitable for all of them), but the size of the taxon is not an issue there.