Family renting 6 years, kids now >18, background check?

[Xavier G.]

Hey Guys, What would you do: this family has been renting for 6 years now and the 2 kids are now over 18 and the lease is going to get renewed. I am planning on adding the 2 kids to the new lease. Would you run a background check? Since I have not had any issues with them for he past 6 years, I am not planning on running a background check on them since I essentially have 6 years of good history with them. I am just curious to see what you guys would do and why? Thanks! Xavier