I had a nest full of white wagtails in my garage this summer. Two parents with three kids. They had built a nest on top of a rail that has a sliding door hanging on it. So that door was out of order for a long time, couldn't use it. A little inconvenient but there was no other way. There was a wagtail nest in the exact same spot last summer, I think it might have been one of the same birds that came back and made a nest.
I watched them almost every day and I was there the day the baby birds jumped out of the nest for the first time. And they are still hanging out in my yard now, I saw three of them this morning. There's something about it, it's so nice to have birds around and just watch them. Especially the babies, they are so funny when they are fresh out of the nest and learning things. And wagtails are extra funny because they often try to run away instead of flying. So if you walk towards them, they run as fast as they can.
Soon they will leave, they fly all the way from Norway to southern Europe and north Africa when autumn arrives here. That's an amazingly long trip for tiny birds I think.