This is a bit complicated, so bear with me:
My now 4 year old's birth cert is his fathers surname
His father now using his original surname, his actual fathers, as I now find out my son was registered in his step fathers name!?
Both me and my eldest have my surname, and I have requested the school use my surname as his 'known by name' - which they have done
We have no contact with 'Dad' anymore, he is not using the surname my son was registered with, so I don't see any problem with me legally changing his name to mine and his brothers?
So how can I change it officially??