This app was mentioned in 2 comments, with an average of 3.50 upvotes
I'm recommending Colt Express, however it's better suited for playing around a table, rather than passing around in the car/van.
https://play.google.com/store/apps/details?id=com.asmodeedigital.coltexpress
When I first purchased it my, then, 7yo was able to get the hang of it and have fun playing the game.
Same price in Play Store: https://play.google.com/store/apps/details?id=com.asmodeedigital.coltexpress