Need advice to train cat

My kittens, and their mom sometimes (but maybe always or almost every time) poop inside the house
Luckily its's on the side of the house where almost no one goes there
But still annoying

Any advice to train them?

Note: before this i have provide a sand box for their poop

submitted by /u/Reigo_Vassal
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from Pets https://www.reddit.com/r/Pets/comments/bmewhl/need_advice_to_train_cat/