I wasn't invested in the first episodes. I don't know the writing was weak, or it just took that much time for the characters and show to gel, or if the show just realized after three episodes it's a drama and not a comedy. After feeling the opportunity cost of the first three episodes and almost giving up, the fourth was so gripping and powerful, tender and heartbreaking. Like Paramitch, seeing real characters in their 70s is also making me feel the loss of my mother. My mom a fan of Jane Fonda, had Grace's meticulous attention to appearance, perfect pose and navigation of social norms at any gathering - party or funeral - and the inner strength to pull herself up out of any rough situation. Jane was amazing and made me miss my mom terribly, but in a cathartic way.
Sol's ability to choose compassion over the insult of being treated as an embarrassment and his insight into Robert's feelings was well-written and well acted.
This episode was the first time I had compassion for Robert as well, despite him being the main villain in the story so far. You get the sense in the first three episodes that he wanted to fast forward to a place where he was settled with Sol and everyone around him had adapted without dealing with the havoc his choices wreaked on everyone around him. The scene at the funeral you can see him realize all the damage he's done to those he's loved that he was trying to ignore. I usually can't watch Martin Sheen without the baggage of his stardom and past roles overriding whatever role he's trying to portray, but in that scene he got me to suspend my disbelief and actually tear up a bit. The episode was so good it made the first three mediocre episodes feel less like they wasted my time.