I think it just depends on their purssonalitys really, i have rescued a mother and daughter, and sadly the mother is always fighting with her sweet daughter, she will go and attack her while sleeping just for the heck of it, it is as if she wants her to leave,it is not constant, but annoying at times, i often have to rescue poor Nikki, mother has bitten her on the nose before and bottom, she does fight back, and is a bigger cat than her mother, but she just seems to let mother be the boss.

However my uncle has two siblings a girl and a boy cat and they are the best of mates, so it just depends on the individual kitty i guess.