Yeah, parents of small children often want bedrooms close together so that they are near them if anything crops up during the night, quite valid reasoning, however as a parent with now teenagers in the house, well, not having them near our bedroom would be much preferred (although they only make the mistake of opening our door at the wrong time once ;))

For electrical - double sockets as a minimum, cost difference of the actual fitting is only a few dollars, so even across a whole house with say 30 sockets, still only talking maybe $100-150 extra cost over single.

Run conduit and draw wire to TV locations, even if you don't think you need more connections, better to have it there and not need it than the reverse (made this mistake, ran HDMI to TV and another to projector, both leads damaged, unless I want to rip gib off and replaster / paint, stuck with no way to rerun them, very tight fitting). Maybe even pre-wire / terminate for surround sound (binding posts on wall plates) with some wires up in the ceiling for Atmos speakers.

In your kitchen, consider plumbing behind the fridge area for plumbed in water dispensing fridge. I'd also put plumbing in/out where a coffee machine would go, but that is obsessive and over the top for most.