we had to re-sleep train Brooklyn at almost 3 years old. It was hell, but it worked and she's back to being an amazing sleeper.(Maxine - do people sleep train their older kids)?
It was way harder than when she was young. Lying in bed at 3am listening to her yell/scream 'MAMA!!! WHY AREN'T YOU COMING?????' was awful. But we all survived.
As for us, Piper is now 4 months old and doing well. We've adjusted well to being a family of 4 (for now at least) and Brooklyn loves her sister. Downside is she's the queen of the catnap and wakes 2-4x a night. I'm exhausted!! Sleep consultant is coming on Tuesday!