Existing Tennants Lease Transfer with New Ownership

[Jeffrey McKee]

Hey everyone.  I recently purchased a duplex in Sherman Tx.  I inherited tenants on one of the sides.  

First question.  Does the existing lease transfer with new ownership?  I have a copy of the current lease, but am trying to get tenant to sign a new lease with all same rates, but my information.

Second question.  

The current lease states one tenant and one occupant.  There is a separate section for occupants.  How is the occupant held liable if at all for rent? I know that if there are multiple tenant's  then they are jointly and severely responsible.  On the new lease i am thinking i should add the occupant as a tenant.  

Thanks!