At their age they shouldn't be needing to wee in the night. Saying that, like humans, dogs produce less at night while sleeping but as they are awake so often, this would be different. Pick up the water 2 hours before bedtime and see if this makes a difference.
If it was me, they'd all be in a nice bed in the family room, don't feel sorry for them, they have each other. Ear plugs plus that distance and you might get some sleep. They soon learn but go them once and you make matters worse.
I hope you all get a good nights sleep soon.
¨°º¤ø„¸Dylan, Poppy & Kipling's ¸„ø¤º°¨
¸„ø¤º°*¨''' ' "*Mummy`` "*'¨°º¤ø„¸