I have THREE 3 year old grandsons who "visit" my wife and I often. When Covid hit, the day-care centers all closed. Some never reopened. Guess where the boys landed??
I now consider myself an expert at handling toddlers.
Structured activities and entertainment are the key. Excursions out of the house take time and keeps their minds busy. A trip to the pet store or the toy store always perks them up. Hopefully, they'll fall asleep on the ride back home because they won't nap at our house.
Long bike rides that end at the park or the lake where they can feed the geese is one of our regular activities. I take videos with my phone and they love to watch themselves when we get back to the house. Their folks like the real time videos too.
One of our boys loves to bake so mama keeps him busy in the kitchen making cookies, cakes or helping with dinner. Then they all get to take fresh snacks home too.
None of my boys watches much TV so we've got to be creative every day. Mixing activities up each day helps to prevent boredom for kids who have short attention spans to begin with.
I never thought I'd get so excited to have a bunch of 3 year old, mischievous boys running around, but I do. On the few days that they don't "visit", we really miss them. FACETIME fills in the blanks around here.
As you age, having kids around is a blessing that you don't realize until you experience it.
And to keep things on topic - yes I've considered buying them a few rubber band guns but they're still a bit wild for that. LOL
Have fun !!