Toby is an almost 9 yr old grey tabby cat. We rescued Toby and his litter-mate Grace when they were 6 mons old. Grace is also a grey tabby but she is much smaller. Their markings are almost identical. We have had them as inside cats their whole lives. They have mostly assimilated with our older cat and have coexisted fairly well. All was fine until we had our 1st child. He is almost 5 years old...