Toddler and baby sharing room. Baby waking up

[fondantfancier]

Hi,

I have a 2.5y Ds who after a lot of sleepness nights is finally sleeping through reliably. Trouble is, he shares a room with his 10mo sister, who whilst is better than he ever was, still wakes up and if left, cries and wakes him up.
At the moment I go in and get her and we bed share so DS can have a decent sleep, but she's getting to the stage where she faffs about, plays, occasionally cries, feeds, faffs about some more for ages til she finally goes to sleep, meaning we get very little sleep.
I know that if they were in separate rooms we could do some sleep training with her and it would work, but how do you get this sorted without waking the first one up (who can then do a full on tantrum if woken up properly)
Any helpful tips?

Watching with interest. My only suggestion is could your 2.5yo come into your bedroom while you sleep train your baby? Then when the baby sleeps through you could put your 2.5 yo back in to share? We are in a similar position so you have my sympathy!

Do you have any relatives or close friends that DS could stay with for a couple of nights? Or bring dd cot in your room with some kind of partition like a blanket inbetween the cot and your bed?

As red daisy said, we just put a temporary bed in our room for my oldest while we sleep trained the youngest (22 months difference between the two of them). It was only for about two weeks at most and not every night. They are 4 and 2 now and share really well, and also seem to have got used to each other so don't disturb each other if one is awake and the other isn't.
Good luck.