1 - Lower the humidity level inside your house.
A dry environment reduces dust mite levels in your house.
It's a fine balance to get it dry enough so the dust mites are down but not so dry that your nose bleeds from being too dry - and everyone s comfort level is different.
2 - Bundle up the kids and have them play outside for a minimum 2 hours per day.
Rain or shine, warm or cold - unless there's lightning, a blizzard, a bad air day, a really high heat index or a really low wind chill factor - fresh air and being outdoors is good for them.
3 - Don't know if you do dust mite covers for your kids beds and do the same for their bedding /bedroom as yours but if you don't you should.
Dust mites anywhere in your home is a problem for you.
As you can get rid of the carpets and do area rugs where you need them.
With the carpets gone - swiffing the floors gives you a great idea how much dust you really have - it's always more than you think and carpet really hides it.
Additional:
Dust mite are ever present.
They are microscopic and it's not really the mites themselves people react to as it is their droppings.
Gross, I know.
They feed on shed human skin cells - house dust is a lot of things but a large component of it is human skin - like %80 of it.
So the next time you dust off a counter or table - think about it.
Moisture - mostly sweat and humidity - sets up the environment for dust mites to over populate.
And of course the more of them there are- the more droppings they make.
Frequently washing bedding helps a lot - we sweat in bed in minuscule amounts but being microscopic the buggers don't need much to get them going.
Much like mold or yeast - dust mites can be controlled by keeping the humidity low.
Keeping up with the dusting helps too.
Make sure your air vent filters are changed frequently.
https://www.mayoclinic.org/diseases-conditions/dust-mites...