We've got six. Four are brothers and sister (Lazlo, Sheldon, Tuxedo and Spooky).
We rescued Lazlo and Sheldon first.
We tried to adopt out Spooky, but it didn't work. And we felt she'd been too traumatized to try to adopt her to someone else, so we had three.
Tuxedo was a terribly aggressive kitty and sent two cats in the colony to the hospital for stitches. He ended up becoming deathly ill and bonded with my husband: we brought him inside when he was close to a year old and it took the better part of most of two years for Tuxie to totally (knock wood) recover. Then we had four.
It seems to make no difference that they're related.
The other two are handicapped. One moved in about six months after Tuxie. The last one came home almost two years ago.
The existing kitties all seemed to understand that the two handicapped kitties were handicapped. They treated them very differently than other fosters we'd had.
None of them are really lap cats, and there is no hierarchy when it comes to getting attention. Because they were all ferals, they all learned to love brushes or pets at different rates. They all ask for attention at different times, and they want attention for varying rates of time. Spook can lie next to one of us and "demand" pets for hours. Tuxedo, until just a few months ago, could only stand a few strokes on the cheek at one time, but would bump and rub his body up along our legs (or heads) with a lot of "gusto" and quite frequently.
They definitely like their own space. They also enjoy, at times, being with us or being with one or the other of the other cats. We'll see them snuggled up in various pairs, though Tuxie as the alpha doesn't. They'll all play with each other and with us.
The only real kind of strong relationship between the cats seems to be between Sheldon (our "ambassador" cat - welcoming and mommyish to newcomers) and Ming Loy, the last addition. She stumbles up to him (into him and on him), nuzzles into his chest, and he pets and grooms her.
All of them except for Sheldon and Ming Loy would be perfectly happy being off on their own or alone cats, but they tolerate each other, fight with each other, and play with each other from time to time.