So, we keep the cats out of our baby's room. They shed way too much and I don't want hair on my…

So, we keep the cats out of our baby's room. They shed way too much and I don't want hair on my son's stuff. The only place they are allowed to be is downstairs. We even put a baby gate up on the stairs to keep them from running up and down it. The little cat can jump over it but the fat one can't and he's the one I'm most concerned about because when he runs, it literally makes a huge thumping noise throughout the house. Well, last night I had the gate down and was in Krystian's room putting stuff away and the fat one tried darting into my son's room and tried to get into the closet. The closet is full of baby diaper boxes and wipes waiting to be used, so this shit head couldn't fit in there. Anyone know why he just tried to run in there when he knows he's not supposed to be? Like he isnt even allowed upstairs and he knows it. He ran out faster than I've ever seen him run before when I said yelled at him to get out. I just don't understand why he was so hell bent on getting into my son's room...again. He's always trying to be in there.