I've read that cats are not pack animals and are more or less solitary. But
they can and obviously do live together. I have a 3 year old male cat who
weighs 13lbs. I also have a female cat that is about 2 years old and weighs
about 6lbs. Both have been fixed.  My male cat has always had an attitude.
If I scold him for something, he waits until I'm walking away and then would
jump, grab my leg, and bite me. He then runs away. He's stopped grabbing and
biting me but still waits until I'm walking away and then follows me, like
he's about the do it.

The cats don't really play together but every once in awhile one will run
after the other. I think they don't play together as the male really never
knew how. What I have noticed is that he will stand over the laying female
and grab her neck in his mouth. He stands over her with his legs on either
side so it would be difficult for her to get away. I don't think he's biting
hard as she usually sits there for a while (I've read that a mother grabbing
a kitten by the neck will release endorphins in the kitten). Eventually, the
female will hiss a little, get away, and run off. What I'm wondering is if
the male is trying to be dominate over the female or if it might be
something else, like his way of "playing".