On the subject of transatlantic accents, I have just had an email from DDiL (American) to say DGD (just two) who has lived in USA since she was three months old, insists on pronouncing tomato the British way. When her mum uses the American 'tomayto' she says, " That's wrong mummy, it's tomato." They emigrated nearly two years ago and there is no sign off DS1 losing his accent, English with a mixture of Yorkshire (me and DH) and Cornwall & Devon (upbringing/education).