Why wont they use the litterbox

I have 5 cats. One female and two males and two male kittens 3 months. My female has had two litters of kittens, both litters have refuse to use the litterbox.. they will go beside the boxes but thats about it.. i have changed litter, gotten new boxes, move them around (had to move one back cause mom is blind and couldn't find it) but they will not use it. What do i do?

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NewRaven · 51-55, F

Some cats won’t share litter boxes with other cats. I had one like that, used one just fine that the other cat didn’t use. Brought a third cat in the house and he stopped using it.