D2, although born in Scotland, moved, in the year of her birth, with us, to the SE.
A few years later, on visits to relatives, cousins and their friends stood around the wee lass, asking her to demonstrate this RP thing which, I may say, she had not received from her parents.
D1, who was about 8yo when moved, took about a week to transition from Ayrshire to Bucks speak.
Flexible little monkeys.