Hello MostlyHappyMum
We are in exactly the same position as you, but two years further down the line. My OH was awarded residency for his (then 6 yr old) daughter. BM is far from being able to parent properly, safely or appropriately because of ongoing alcoholism. Very very sad Her solicitors advised her to accept the recommendations and she did. It was long drawn out though because she was too drunk to turn up to the previous two hearings
little one lived with us with immediate effect, but was in fact living with us already. children's services were involved, because BM had been both arrested for neglect and reported by the school, and CS said that if we didn't have her, she'd have to go into care. Awful for all of us, but having her here with us is the least worst option.
My OH tried to keep contact going between little one and her BM, but we came to the end of the road at the start of this year because he was just not able to judge whether it was safe to leave little one with her even for an afternoon, and it was causing so much distress to her.
We went back to Family Court who on CAFCASS recommendation have ruled that all contact for the time being is to be Supported Contact at a Child Contact Centre, once a fortnight, and BM to have bimonthly liver function tests. The next review is in September.
The first contact visit is taking place as I write, it's the first time little one has seen her BM for over 4 months
Ultimately, like you, we'd rather she was living with her mum, as kids should be, but that's just not possible right now, so I try to mother and parent her as best I can. Not an ideal situation, but luckily we have a very loving bond, so there's more smooth than rough. Hard flipping work though, mothering someone else's child when that someone else wishes the fires of hell would burn you up.
Good luck - let us know how how it all goes.