IMO in order to be an 'inheritor' you would have to have been an active participant in the 'community' the song was part of, i.e., a particular occupation, a hunt pack, a ship's crew, the armed forces, a playground community, a village community etc. Otherwise, like me, you are a re-enactor. I learnt several songs as part of my family, but I would say had I not become part of the folk scene these songs would have been long forgotten so I am definitely to all intents and purposes, a re-enactor.