I'm fortunate in that I have a separate daycare space separate from my home. Sooooo I agree with above poster. Keep your children's special toys in their rooms and off limits. Put a child lock on the door handle so the daycare kids can't get in. I only use my bedrooms for sleeping. All the rest of the toys are "your" toys not your children's. Scour kijiji and find some cheap toys for the daycare ( keep a journal of items and price that you paid cause you can claim this on your income tax) and let your kids know these are not their toys and put they away at the end of the day. Ikea has some nice storage units with bins which you could probably fibd used on kijiji as well to keep toys in so they are contained and have the ability to be put away and out of sight at the end of the day. I too live in the middle of no where and although I do have a van I do not travel any where with my dcks. I have several acres and several play structures and lots of outdoor toys and ride ons and we go outside everyday for 1.5 hours. Between that and lunch story time and naps there's not much time left over. You don't say how old your kids and the dcks are but maybe a craft or play doh at the table .... Strap the kids in booster seats so they are not getting off the chairs. Try some sensory bins at the table also while they are strapped in if they are hopping off the chairs to take something from another child. Try making an obstacle course or a game of follow the leader outside to get them hopping/ jumping/ skipping ect , build big towers with duplo or mega blocks. Something to get them working together on a certain task.
Just a few ideas.