Tom + Gerri turn patronizing and condescending as the film progresses.

I take a balanced look at Tom & Gerri (can't help smiling every time I type their names). These aren't bad people, but they're not perfect - "careful my halo's slipping" Gerri jokes at one point. Granted they take some amusement in Mary's chaotic misfortune's but Gerri does try to come through for her at the end, albeit somewhat condescendingly - she correctly identifies her as needing independent professional help (in lieu of genuine friendships and a solid relationship). Tom is less tender and displays more irritation at Mary, keeping his genuinely held feeling for Ken, especially as his friend drunkenly breaks down when talking about how empty his life has become back in Hull. Gerri tries to help Jack's wife whatever it is she's suffering from, but without much success by the sound of it. It's a little disturbing though when Jack says rather glumly that he and his "keep cheerful" and then looks anything but, Gerri ignores him. (Whatever else Gerri may or may not be she doesn't seem to be totally successful as a counsellor, she makes little headway with insomniac Janet and admits to Tom that a patient she is meant to be treating for alcoholism arrived drunk for a session).
Tom clearly has little time for Carl but not many people would when he starts off from a level of hostile bitterness and then just turns it up to 11. After all it's no one else!s fault that he arrives late to his mother's funeral. Gerri tries to pacify Carl and show him some family feeling but the damage is already done, from some time much earlier perhaps? Gerri probably dislikes Tom's brother Ronnie, but keeps her feelings in check and tries to be supportive. She probably thinks, like Carl, that Ronnie was a poor husband to his late wife.
The major criticism that can be levelled at the couple is their liberal plying of alcohol on people who clearly have big issues with the demon drink. There's barely a scene where alcohol doesn't play a part. And any meal Tom and Gerri prepare require booze not only at the dinner table but to be consumed during cooking and even earlier.
The crux of the matter is that everyone else appears to put the family up on a pedestal. It wouldn't occur to Mary, Ken, Joe, Ronnie or Jack to criticise the couple for their attitudes towards them. In fact it's only Carl who comes close to bursting their rather complacent bubble but because of his obscure (to us) rage we can't take him seriously.
The one character who I wouldn't trust one iota is Joe's new girlfriend Katie. Despite her bonhomie, she's a taker - wolfing down bread and cheese, cake and taking home Gerri's fresh tomatoes, but above all she quickly gets the measure of Mary and proceeds to push all of her buttons. As she chews over the "lovely cake" she looks around with a secretive smile of satisfaction at the damage she caused.