I was stopped on the way back from holiday because of this, they started quizzing my then 2 year old ‘who’s this’ whilst pointing at me. She naturally would not say mummy. They told me I should take her birth certificate next time but literally never been told that until that point and I don’t think there’s any legal need to. Was pretty scary though the way they told me they weren’t going to let us through. Yeah, that’s right, give me, the parent who stuck around, all the grief.