Help me esterilize my cats

Hi my name is Cristhian, I'm from Lima Peru, and now at my grandpa's house my mom and I have 11 cats, almost all of them were strays, it's not easy to keep them, due to the need for cleanliness and food, but now I hope that They could help to sterilize them and thus avoid many fights. One of my cats (Gopala) has a tumor in his belly, to receive the support I will be grateful forever, always wishing that everything given is returned and multiplied by a thousand in happiness and love in their lives.