It would be nice if Rob died under the general anaesthetic.
Yes, he is the tenant at BHC. It's a mystery how he's been paying the rent all these months.
Re Jenny and fidelity:
Adam is her child by a red-haired Irish cowman, Paddy Redmond. Adam is supposed to have red hair, but I don't hear him like that (this makes sense in my head). There was a huge scandal (in the country generally, not just in Ambridge) when Jennifer revealed in 1967 that she was pregnant as she was (get out your smelling salts) not married. PR had left the village and there was never any question of marriage in any case.
The following year Jennifer married Roger Travers-Macy who adopted Adam. They had Debbie in 1970. He proved to be a rotter (before my time, don't know the specifics) and they split up in the early 70s.
Brian and Jennifer were married in 1976. They had Kate and Alice together. Before long, Brian's roving eye became a recurring storyline. However, according to the BBC website JD was the first to stray: she had at the very least an emotional affair with John Tregorran (husband of Carol, father of Anna) in the early 80s. Then she had a brief fling with Roger when he reappeared in her life hoping to rebuild his relationship with Debbie.
As far as I can recall, that's been it since.