The protagonist's father was a hateful piece of shit. Even if we ignore the situation with MC and his mother, there's still the thing with Alice and her mother.
As for MC, MC's grandmother, MC's father: it's been a while, but if I remember correctly the situation was something like this, Killer7 feel free to correct me if I'm misstating important details somewhere:
Grandma coerces the protagonist into making this phone call to his father, which he had no interest in, he already knew that his father was a bastard. This leads to a big conflict within the family: Becca is understandably angry with her mother, Maddie shares this feeling, Sandra doesn't want to acknowledge this information, Mary is on her mother's side (as we learn in conversations), Alice is largely neutral but probably won't be happy about this situation either, and Lucy can understand her grandmother's motives but doesn't approve of the way (forcing the MC instead of giving him the choice). In a more realistic scenario, I can definitely see this being a trigger for a family implosion, with quite a few people breaking off contact and not talking to each other afterwards. But it could also be because my family had their meltdown over money and the death of the matriarch, my grandmother, so I'm a little, I don't know, skeptical or cynical.
It's also worth remembering that MC's grandmother's law firm is responsible for getting the guy who hit Fiona's sister off, for which Fiona held a grudge against them for a very long time (understandable). However, in her (MC's grandmother's) defense, I remember her kicking the lawyer responsible out of the firm afterwards, if I remember correctly. Then again, it's also mentioned that the only one (until MC) who stood up to Elaine (MC's grandmother) when she went too far was her late husband. Which is understandable somewhere, I don't think she would have listened to one of her daughters, especially when the other daughter always reaffirmed her in her modus operandi. One can argue that she would listen to her grandchildren even less, but a lot of the protagonist's manner reminds others, including Elaine, of Elaine's late husband.
And to answer Elhemeer's question: No, he never showed an ounce of remorse until the end. Neither about Becca nor about Alice's mother. I believe I remember that my first impression was that he was quite complacent or self-righteous about his actions at the time we interacted for the last time.
