Our pride of cats started out about 27 years ago with a wild cat that I found in a rock pile in the city. She was maybe 6 to 8 inches long, though was not actually all that young in spite of her small size. I took her home and fed her some of the turkey as it was just after thanksgiving and she ate like she was starving. Interestingly the next day with a full belly she actually stalked the meat that I gave her and then jumped into the air and pounced on it hard. I recognized the behavior from watching coyotes and realized that she was already practiced at hunting.
By the time we bought out first 200 acres about 13 miles from here she had a litter of kittens and we moved a total of about 9 cats out there onto the farm with us. I built a large 14 foot by 14 foot wire pen that was about 18 feet tall in the center of the roof. I put an old tree inside of it with extra branches and whatnot and kept them in that building for the first 6 months so that they could acclimate to the new place.
We have had many new additions to our pride over the years many people needing a home for their cats or people simply stopping on the county road and kicking their cat out at our driveway so we have always had new blood added regularly into the group.
After 27 years of this we have a very stable group that is awesome at hunting, they have even learned how to catch fish in my ponds from an older cat "Grey stray" which joined the group in about 2000, we found him in a ditch alongside the road as a young kitten. Our average population generally remains between about 12 and 15 cats, sometimes drops as low as about 9 and has been as high as 20 at times. We got pretty low a few year back due to a combination of hawks, owls and red kites hunting them, but they eventually got wise to that and our population has rebounded.
Like the OP's cats interestingly my males help to raise the kittens as well. Grey stray was great at that, he would fish catfish out of the pond and drag them into the yard for the kittens and then stand guard to make sure that no one stole the food from the kittens. It is interesting watching our cats as they behave differently than other domestic cats.