I think his parents have known at least since he purportedly flew back to Florida from SLC that there were signficant problems of some sort. The story about the departure from the trip and moving her personal items to or from the home to or from a storage unit is exceptionally strange for the trip they had planned, through the west ending up in the Pacific Northwest.
If you find out what went on during that time he was back in Florida, I think you will have an idea of what he was planning. Based on my impressions, I think he came back with the intention to split up with her. This would, of course, completely stop the VanLife blog as she really needed someone else to run the show while she blogged.
Her father is the one who described the trip he took back to Florida and the purported reason to avoid paying for a storage unit. Which sounds completely bogus to me. I'd have to think her father was paying for the SLC hotel, as she couldn't afford it. I just wonder if her father talked to BL at some point in this part of the saga.
I think it was also her mother who was the one who had the date he returned to Florida, though I'm not sure how she came about it.
Anyway. There is no way his family did not expect his arrival. There is no way he didn't arrive without some texts from the return trip, or a plausible reason for his having the van without her.
This was not a surprise for his family. No polite niceties "they broke up, her stuff is at our house, please come get it". And no pretense at innocence about the events that transpired. They know. They know full well.
They were prepared enough to stonewall her parents for 10 days. Let's not forget that at all.