My son is a toddler so just starting to build words. I'm from NE but live in an area of London with a "neutral accent" - DH has more of a London accent (not neutral)
I say BOOK rather than BUCK, GRASS rather than GRARSE etc.
His nursery when he goes back has lots of different accents including nationalities and regional accents.
Just curious how your children's accents developed if you live somewhere different to where you grew up.