Protect One Predictable Thing And Let The Rest Move
Trying to make a whole week reliable fails; making one part of it reliable usually holds.
Ambitious household schedules collapse because they assume a week that behaves. Weeks do not behave. Work runs over, buses are late, someone gets sick, a parent needs a lift, the thing you booked gets moved. A plan that requires eleven fixed points will lose most of them by Wednesday and the whole thing loses credibility. After that nobody trusts the plan, which is worse than not having had one.
A more durable approach is to pick a single fixed point and defend it hard. It might be a meal everyone attends, a morning where nobody has to be anywhere, a walk, a standing half hour where two people talk without a screen, or simply a night where the house is not doing anything. One thing. It goes in first, everything else arranges itself around it, and it moves only for genuine emergencies. Because there is only one, it is defensible, and because it is defensible, it actually happens.
The fixed point does what a longer schedule cannot: it gives the week a shape. People stop feeling that time is simply happening to them. It also creates a natural slot for the household conversations that otherwise never get had, because there is now a reliable moment when everyone is in the same place and not mid task. Households without children benefit from this as much as anyone. So do people sharing a house, and so do adult siblings living together, who often have no scheduled overlap at all unless someone builds one.