A little back explanation, we are in North Africa, we got two kittens about 3 weeks ago and they are about 12 weeks old now, possibly 2 weeks younger.
For the first 2.5weeks they were inside most of the time and I dug dirt from outside for their litter tray. They are improving with their hunting skills so we started leaving them outside over night a few days ago so they would get a chance to catch better prey. About 3 mornings ago I let the kittens back inside in the morning and one of the kittens dashed to the sheepskin and did a huge wee. I washed the rug and moved the cat litter box outside and whenever they were sniffing inside the house I took them to the litter tray. Yesterday morning was fine but this morning when I let them in the house in the morning the same kitten went to my daughters bed and did a huge wee (second kitten is fine).
So, any suggestions of how to stop this? I thought perhaps I could take the kitten to the litter tray in the morning before I let her in to make sure she wees first, but is she actually marking her territory? Plus I'm not sure how to move them on from the litter tray to just using the dirt outside (especially as it's the same thing!).