Oh don't be sorry...some of us are famous ramblers well I'm glad he's old...that does usually deter them from hunting...in my experience...but I'm sure there are exceptions....but since you don't see anything killed in the yard...that's a plus maybe when it's time for the babies to leave the nest...you'll see them leaving from the closet you can keep a closer eye on the cat...maybe ask your parents to keep him in....but as you said, hopefully momma will teach them I think it's good that you and your parents look out for him...my mom just took in an old cat...probably 8-10... her neighbor moved and left her my mom has taken her in....it took about a month but she's inside now but all animals are different