Thank you for your question
My name is ***** ***** I shall do my best to help you
I am afraid that the fact that they are not married means that she alone has the right to Register the birth - and to chose the name that will be used.
This will make no difference to the legal relationship between father and son - and of course when the child is 16 he can change his name if he wishes to do so
I hope that this is of assistance - please ask if you need further details
Whilst he has to be there for his name to be on the birth certificate since as the mother only she can register the birth limits your son's options.
If he does not agree with her then he cannot insist that his name is ***** ***** since she can then just go ahead without him - but he cannot go ahead without her.
The fact that father and son do not have the same surname makes no legal difference whatsoever - anymore than it would if the mother and child had different surnames.
There is no activity that he cannot do with him - and he is unlikely ever to be challenged to prove paternity - other than on those occassions when he would be asked to do even if the did have the same name
He will still have to be consulted on all major issues - and in due course the school will have to give him any information he requests