Im new to the forum but have looked online and on some forums regrding a solution to a bit of a problem we are having with our new kitten.
A bit of background...
Hes a 15 week old Rag Doll and hes been absoltuley wonderful for the past couple of weeks stopping and sleeping in my sons room at nights and things were fine. In the last 6 days we have changed his routine a little bringing him downstairs into my office with me in the day and taking him back upstairs as well as letting him roam (under supervision) around the house before taking him back up to my sons bedroom at night.
We have a female older cat Jess who is very terrortorial and who we have slowly been trying to integrate together and although he (coal the rag doll) doesnt really seem remotley intimidated by her, we felt like she was slowly accepting him albeit she is still hissing if he gets too close, but have noticed when she thinks were not looking she runs at him intentionally to hiss and what looks like a way of intimidating him....almost like she might attack him. Because of this we are massivley reluctant to let him roam free around the house from fear the older female cat might attack him, or he falls off the landing etc.
So as of the last 2 days the kitten has started whining and scratching the carpet at the door like crazy whenever we leave the room, to make a cuppa, answer for a delivery etc and when wed open door he would shoot out and wed be left with a damaged carpet

To make matters worse my son wasnt back until late last night so we took Coal up as normal, really playing and trying to tire him out with a few games but when we left the room he started whining like crazy and ripped up my sons carpet at his door so bad and so quickly we struggled to open the door. When we finally got in i ended up having to sit with him and stroke him until he settled. Only to bring him down again today and him doing it again whenever i leave the room.
We have tried ignoring him (although obviously not so long due to wrecking the carpets) we have tried putting card and blankets down to protect the carpet but not sure its making any difference and we really dont know what to do. We are so scared of our other cat attacking him if we let him roam not to mention all the other dangers around the house, we cant let him sleep in our room because our older cat sleeps in there and dont feel its fair on her.
Are we being too soft, should we have made him get used to sleeping alone initially?
Any advice or help would be appreciated