Willy wagtail babies

A family of Willy Wagtails live in our very old horse float. They have nested there for 3 years. They seem to lay eggs, hatch & grow the babies, then lay again straight away. There are 3 babies in the nest at the moment. We had to move the horse float today & the parents were most upset. All babies were safe & sound in the nest after moving. They only moved about 70 metres.