Activity of John Boy

Any help would be great, top table seating. Mother and father to be on the top table, father contributing quite nicely to the proceedings, however he wants his long term girlfriend to be sat on top table as well, I do not want this to happen but we...

Bit of a conundrum, stag do being planned by the Best man however do the attendees of my last weekend of freedom expect an invitation to the whole day at the wedding or is being invited to the night time do ok??