Kittens fighting

I have got 2 baby kittens from the same mother they got on great and are 9 weeks old, then yesterday I got another kitten 6 weeks old who is from another mother . Now the first 2 I got dont get on with each other and one of them hates the new kitten can...

kittens from different mothers live to together and how do I get them to like each other

What do you mean by 'hate'? Is the kitten growling and hissing?

Just make sure you aren't confusing playtime with fighting - their playfulness can seem like aggression at it's best.

Even if they aren't getting along now, they will learn to...it just takes a little time...let them discover each other at their own pace.

its better to determine the sex of the kittens if the new kitten is of the same sex of the other kitten that doesnt likes it thats the problem you can spay or neuter them

yes, those answers before say it all. I got a kitten named bracket ( I know) and when I brought her home, my 11 year old cat was curious, sniffing and such, but he was fine with her. tghey got along just fine. Then sadly bracket went missing a while later (months) and my neighbor said he saw her in the rd, (she got hit) so I got another kitten named sugar. She did't get along well with my older cxat (MOO) and he did;t like her. They hissed and such but after a while, (it may even take months) they eventually got along great. Same with my dogs, I got a puppy ( I already had 2 dogs) and her name was lily. My dogs wouldn't even go in the same room with her, and they didn't like the change. Your kittens may not like the change right now, but keep encouraging them to get along, slowly! DO NOT FORCE!!! try rubbin a sock on the new kitten and placing it near your older kittens, when they play, sleep, eat, etc. so they get used to the smell( they may not like it at first) but slowly they should get along, try the same thing with the little kitty, ( sock rubbed on older cats, put near 6 wk old kitten) my dpgs get along great now! The 3 amigos!! (as we call them!)
~Carrie~