So who should be on a lease?

[Tracy Thompson]

So after reading "Rental Property Investing" five times and reading "Managing Rental Properties" twice, we have purchased two homes at auctions and are getting them rent ready.  We are also currently working on writing our first lease agreement, our question is if we include all of the tenant's children/relatives etc... age 18 and older that will be living in the home on the lease and if the mother or father leaves, moves out, etc... will all of the remaining adults on the lease be fully and legally responsible to fulfill the remaining months on the lease?  We are located in Ohio.  Thank you.