Hello all! Today is the second day I brought a new kitty home (a 13-week old female kitten to a household which has a 16-week old male kitten). We had the 16-week old male kitten since he was 5.5 weeks old. Both cats are not neutered or spayed yet. The male kitten is having issues and is being very insecure/jealous. We got the female kitten her own litter box and some toys but Vega (the male kitten) hisses at her and has not accepted her yet (and even uses her litter box!). They can get near each other but Vega likes to chase her down from time to time. Anyhow, any suggestions? Thanks in advance!