I've not read or listened yet to any of the docs that report Mr. Sterns Sr. (CS) in the area and/or staying at the same hotel. But I do recall from the docs that JS/SS stayed at a hotel located about 30 mins from the Soto residence after LE took custody of the condo to execute a search warrant. (IMO, I got the feeling that LE was surprised that JS would choose to stay a distance away from home when her missing child could surface at anytime). As observers, we now know that MS showing up at home was never going to happen.
^^That said, I think it makes perfect sense that Mr. Sterns Sr. (CS) would have traveled to Kissimmee sometime (post Monday) after learning that his adult son, allegedly dropped MS off at school, and that she never made it to classes, and was in fact missing. I think we need to remember this had been longtime relationship where SS had been in MS's life for more than half of her life, her friends reported she loved him, and they were close. This is likely the image SS's parents had too.
I think traveling to be with JS/SS at what for most would be an excruciating time would be the gesture of any able parent/grandparent to support their adult child/family.
Unfortunately, I'm sorry to say that I'm still thrown off when assessing what's truly a normal act of human compassion, because JS never did fit what one expects from a mother whose only child is missing!
On the other hand, SS immediately started "acting" the part. I don't doubt this mimicking behavior by SS has been used for most of his life to control his father (or anybody known to provide for his needs). MOO