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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Spoiledbrat · F

I'd find new homes for at least 3 of them and get new boxes for the two you keep.

Wizkid22 · 41-45, M

@Spoiledbrat i am.. was just wondering why only the kittens wouldn't use the box..i mean with the 2nd litter mom kept putting them in one of the litter boxes at 5 weeks