Alley Cat Allies is a worldwide advocacy organization and is not available to provide hands-on assistance for individual situations. The best approach to the cats in your yard is Trap-Neuter-Return (TNR), and you can learn why at alleycat.org/TNR.
If you need someone to help you with TNR, contact a member of Alley Cat Allies’ Feral Friends Network near you by visiting alleycat.org/FindFeralFriends.