i have two really good friends who purchased a kitten from the same breeder that we got our cat from, now one bought a female and one purchased a male... see where im going with this? the mother of the kittens are different the father is the same. now the male cat is almost a full year old i believe he said. she purchased the girl cat this past friday. so the litters where about a year apart. would there be any tipe of birth defects or retardness ( i dont know if thats the proper term that i should use) from them if they were to breed? i think there would be because technically there 1/2 brother and sister. any information would be appreciated.