I'm originally from the South of England, but have lived in the north for 20 years now. I have a bit of a mixed up accent but nothing major. I still say the 'ah' sound in grass, path, castle etc most of the time. DH comments a lot on this and has said a couple of times that DS (3) will get bullied for saying 'grahss'. I would obviously hate for DS to be bullied, so have started becoming more conscious of my 'ah'ing...
However, I know some people that have grown up in the north of England and still speak with an old- style bbc accent.
And DS might be more bothered by DH picking up on and scrutinizing my accent and DS's.
Am I being unreasonable to just carry on talking how I talk? It's not a strong accent.