Can you have more than one mate?

Yes, you can have more than one mate. If necessary, send your mate home, then look for another one. That way your mate won't kill the newcomer, and you can get a mate the way you normally would.

You can make a clan if you use your imagination. If you are referring to Warrior Cats Clans, those are fun to create in Ultimate Cat Sim. Just use the hollow log as your den, as well as use the surrounding area as your camp. Kittens 1-6 are kits, apprentices are 6-12, medicine cat apprentices are 6-15, warriors are 12-35, senior warriors are 35-70, med cats are 15-70, elders are 70+.If you are WindClan, hunt only rabbits and a few squirrels and birds. If you are ThunderClan, hunt squirrels, birds, and mice. If you are ShadowClan, hunt lizards, frogs, and rats. If you are RiverClan, you probably can't hunt fish in game, but you can hunt other aquatic animals such as frogs, lizards, ducks, and dragonflies.

I have a follow up question do you have to be a certain level to have more mates.

I don’t think so