Mistle thrush fledglings

We had a very chilly (where is Spring??) walk through the woods today and saw a pair of green woodpeckers and then a pair of jays. There was a lot of noise as the jays flew off and I thought it was baby jays calling their parents back. Looking into the trees for where the calling was coming from we found three fledglings sitting on separate branches. They were quite big but having got home and checked the photos, and asked on a website for advice, I think they are mistle thrushes. I have been told it is unlikely the jays would take them, unless the parents were nowhere around.