Talked to our son this morning. He says that the water has dropped about a foot in his neighborhood but that other housing tracts near his have had rescue operations underway in them and that families have had to be evacuated by boat to the local high school, including several friends of his daughters. So far he says that he has never lost power, although his cable TV and internet service is out.
His company is trying to reopen as many of their local restaurants as possible (they have three in the greater Houston area over which our son is directly responsible) so he's going to attempt to drive in to one of them where the flooding has not been as bad so as to help to try and get it open, but that's still about 15 miles from where he lives.