Just had a worrying event taking grandchildren on holiday with my son their father. Unfortunately the dad lost the childrens passports between getting on the plain to tenerife and getting off. How we dont know but obviously because we are no longer in the european market the children were refused entry and they were all sent home. The dad had his passport but goodness knows how the kids went missing.
The spanish border control were not having any of it we had pictures of the passports Then they realised that the childrens surname was different to the dads. Despite getting copies of their birth certificates sent over from the mum to border control and He had a letter of consent from her to take the children out of the country they wouldnt accept the letter because it had not been notorised which we thought you didnt need. So word of caution be careful with letters if you have one.
I have to say we went to majorca last year and they didnt even ask for a letter.