I highly suggest that daily one enters into the Way of the Cross for morning or evening prayer. I suggest having your children meditate on this, even outside of Lent.

I suggest pictures, like these, for the young ones.

https://www.chcweb.com/catalog/StationsofCrossPrints/product_info.html

I highly suggest buying these above.

I have these as small holy cards, but I do not know how to find the small ones in America.