I have had my 12 year old Sooty since he was 4 years old, and sadly we lost his brother in November, so we decided to make the numbers up and in March brought in three kittens, now 12 weeks old, one female and two male. So far Sooty hasn't taken too well to them because we only have a small house and have to seal off certain rooms while we are at work so that they don't destroy our belongings, so they are kind of crammed into a small area really. But they know their place around him and he generally hides under our bed during the day while they race around keeping themselves amused. Sooty was castrated (I believe) before I got him but has always liked to get 'friendly' with sofa cushions now and again. Tonight he was doing his usual cushion thing but decided at the last minute to hop off and jump onto our little Tiger-lily female kitten, biting the back of her neck and looking as though he wanted more! I brushed him off of her and he shot off into the next room. Now, she is only tiny and I am worried that he is trying things on with her while we are not here. I have checked his bits and bobs and we are sure that he no longer has any lumpy bits down below, and we always assumed that because he has this likening for cushions that he was castrated a little bit later on in life and still gets the urge. Our other two kittens, Thomas & Noah, are just gorgeous, but we have noticed that Noah too likes to sidle up to Tiger-lily and we did find him in the mating position with her the other day, although he was only licking her on the neck at the same time. We think that this is all probably normal behaviour in creatures, but we have never had kittens before, or kittens mixed in with adults, and all of mixed sex, and we are slightly worried about it all. Need we worry? Anyone else been in the same boat with their pets? We will be taking the kittens in for their booster vaccinations in two weeks time so will discuss things with the vet then. But in the meantime would be interested to hear your opinions on the subject. Thanks in advance. PS - I have tried to attach a photo of them but failed miserably!! Any tips in the department?