Really? I don't notice that. Maybe i should reread again. Thanks for the hint
it's probably because of these:
http://dynasty-scans.com/chapters/stretch_ch06#8
http://dynasty-scans.com/chapters/stretch_ch06#9
http://dynasty-scans.com/chapters/stretch_ch10#17
http://dynasty-scans.com/chapters/stretch_ch13#7
So one may interpret this as:
she went to see her parents for the golden week, was at the sea wearing all black, the picture of her parents has her dad's face hidden in highlights, and she said her mom's much better now, and... you get the point.
At least that's how I also read it at first, but after I realised that because of the earthquake she was calling Keiko in ch.6, not her mom (she said "Good night, mom" to the bar owner, not to her actual mom on the phone), I came to read the story line in a somewhat different light:
Ran went to see her parents for golden week, went to the sea and remembered Keiko's graduation, how they parted ways in the past but eventually got back to live together.
I think Saeki's genuinely happy and actually has conscious feelings for senpai. She totally missed Keiko over the holidays. That's why Ran remembered senpai while watching at the sea. It made her feel lonely. And it seems she finds herself safe and secure enough to fall asleep with a smile on Keiko's laps. To the point that her home is now here, not at her parent's place
As for her dad... well, there's still a possibility that he did die, or her granddad, or her mother was sick. There must be a reason for that dialogue in ch.13. But what exactly happen, we'll only find out later, hopefully soon. Whatever the case is, it certainly lands on the family-parents-living-together-home theme.
Sorry for the long post, I'm terrible at pexressing my thoughts in short phrases ^_^"