I find myself referring them to the menu plan when they want to know that is to eat. Or asking them to look at my hands before they ask a question because the answer can often be found there. If it's practical stuff, they know what our routine looks like and can repeat it. For your kiddos, I might consider posting a general schedule if you follow one daily. So you don't have to think about it, just point them to the wall.
I also encourage mine to figure out how to answer their own questions if it's about random things that they can look up in a book or wherever. I feel for you. Our families are made up of pretty much the same ages plus an extra 1 year old.