YOU SAID:

if I have a cat I'll take care of it with other kittens

INTO JAPANESE

猫がいたら他の子猫と一緒に世話をします

BACK INTO ENGLISH

If you have a cat, take care of it with other kittens

INTO JAPANESE

あなたが猫を飼っているなら、他の子猫と一緒に世話をしてください

BACK INTO ENGLISH

If you have a cat, take care of it with other kittens