Cat peeing out of the litter

Hi,

I have 3 cats, all females cats. I want to know why they are peeing out of the box. So i need help to fix this.

So, before i had one cat named grace. She didnt pee out of the box at all. She wasnt operated and went outside. She got pregnant and had 4 new kittens. We kept 2 of them which were females because we became attached to them. However, she had another pregnancy and got 5 kittens. We gave all of them to a knew home. That's when they started the peeing started. The other thing tht changed is that they fight alot. at first, i though they were playing. but it wasn't. We though that it might because of them  not being operated. So we operated them. However, although they stopped peeing on some area. They still pee and fight. My family think on kicking 2 of them out but i want to keep them all. 

So I'm asking how i can stop them from peeing on the floor.

How many litter boxes?  You need 3 boxes, plus one, so 4 total. Some cats don't like to share with the other cats.

they become a territorial....

everyone of them want to their own territory signing it by urine...

for me keeping 4 cats in a house is very costly... + very missy

some cats are lazy so they don't care about territory except the place that they are sleeping on it at a current time...

some are too aggressive for this....

I had my cat it was using 1 litter box.....

a kitten arrives my home it stayed with me for 2 days it was using the same litter as my cat

and they were fighting fir 2 minute and playing for 3

when a new female arrived it refused to use the litter box my male cat used and it become aggressive when i put her inside 

i putted some of her feces inside so it used it.. surly after my male kitten wanted to leave the house for  mating....

this is another point... if you don't something about it 3 cats will keep you awake in mating season

you will be crazy...

I know 3 methods

1-keep 1 of them "also will kill you in mating season"

2-castrate and spay 

3-the number of litter box = the number of cats + 1 "for urine problem only"