What does sal notice about phoebes parents that reminds her of the pickfords her mothers parents?

Sal notices that Phoebe's parents exhibit a similar level of tension and complexity in their relationship as her own grandparents, the Pickfords. Both sets of parents seem to struggle with communication and face emotional challenges, which evokes memories for Sal of her own family's dynamics. This resemblance highlights the theme of familial relationships and the impact of emotional struggles across generations.