In the dream, a friend's daughter (B) moved in with us. She was about 15 in the dream (she is actually older in real life - my eldest dd is 15 though - might be relevant?)
We took her to a big country park with walks, playgrounds, fields, country house etc. She had a massive orange backpack - so stuffed full it was round, but she carried it easily. At the end of the day we were heading back to the car when she asked if she could have an ice cream at a cafe. Husband and I both agreed that even though it wasn't convenient it was important that we say yes and make her feel welcome and able to ask for things. Husband took the kids back to the car and I went back to find B at the cafe, but it had closed and B wasn't there.
I spent ages looking for her everywhere. Occasionally I'd catch a glimpse of the orange backpack in the distance but I couldn't catch up. I was shouting her name really loud, and she heard me once and smiled when she realised I'd been looking for her, and turned around to meet up with me.
I bumped into B's family having a nice picnic and asked if they'd seen her but they hadn't. I wondered why we didn't come to this park more often, because B's family come all the time.
Finally I found her in an upstairs room with a load of tattooed, pierced, shouty, raucous young people. She was fine. They were rough, but nice. We walked together with the gang through an underpass back to the playground and the car park. I woke up.
In the dream all my children and all B's siblings were much younger than they are in real life.