is he in fact not the father, is it actually....Charlie?!
i seem to remember when he was with Shelly he went out on the pull and got it on with this random girl in a back alley, and he toald her his name was Jasoon Grimshaw! so the girl tracks down the real Jason but only sees Eileen at the front door, and there we are. i would assume that when the social track her down they'll all meet up and she'll be like 'hang on...'. am i right here? i would then assume this would be the final thing to push Tracy over the edge?