Hi there so recently I took in 4 kittens from a friend there are 2 males and 2 females all healthy and very cute and active.They are only 8 weeks old. My concern is when I should get them fixed...I am going to be calling some vets in my area to check when to get them fixed but in the meantime should I separate the males and females? I don't want one of the females to get pregnant on accident that's my biggest fear also because they are siblings.