I do not think they kept regular routines in their house/family except when they specifically needed to do so. Jmo moo
RL told CM they (DW, CB, SW, all three boys) were always on time to church, for example. So, their church is on Saturday. But, if they need to be somewhere, they can make sure to be there.
Other days or times of the day are probably more freeform. A lot of people are like this.
Maybe that is why some of their decisions are hard to reconcile with how most people do things such as SW being taken to the horse pond to splash around while they waited on Walgreens.
Jmo, SW going "swimming" was not the only reason to go to the park. Because of H going into the woods and coming back "throwing gang signs" (per CB in her conversation with CM). Soo.. what was that about? Anything?
At first I thought the trip to Kingsport was unrelated to SW's disappearance, but since we don't know what happened to her, then i guess I feel like it is very hard to say what is relevant and what is not.
As far as CB being ready to prepare a meal, has she ever mentioned this ever at all? She has given minute details on other things, so i don't really assume she was doing that. Idk what she was doing other than what she has told us.
DW, meanwhile, said he decided to work late because "nobody was home". However, the boys were there all day and everyone else got home hours before he did. So, even when I try to use CB's narrative of the day, problems arise. I don't know why this is. I am trying to make it work.