How to stop my kitten from bullying a mommy cat?

One and half month ago we rescued a kitten whose mom had been disposed by their owner. The kitten, Golden, is now almost 3 mths old. A fews day ago we rescued a mommy cat with five newborn kittens from being disposed. The mommy cat looks contend with her new home. But my problem is Golden. He bullies mommy cat as soon as he wakes up. He jumps on her, bites, punches mommy cat - looks like if he treated her as his friend more than an enemy or a competitor. Mommycat looks annoyed even though she does not punch back. Golden also found to be interested to the kittens and we are worried if he jumps inside the kittens' shelter (just a box). Golden sucks our earlobes as he missed his mom, and we are wondering if he might feed from mommycat's. Today we separated them in two different room, but I don't like the idea as I prefer them both to be free in the house. FYI, Golden is a hyperactive kitten, even my vet said that he is a cat. Any advise please??