He has a son named Sylvester Junior who first appeared in Pop ` im Pop on 1949 . Sylvester J. Pussycat , Jr. , or simply Sylvester Junior ( he is also referred to as `` Spoiled Brat '' ) , is the son of Sylvester the cat . Junior first appeared in the 1949 short Pop ` im Pop , directed by Robert McKimson and eventually appeared in a total of 11 shorts in the Golden age .