Roger,
Not to get long winded here, but the one point your failing to realize is that you aren't the sole owner of these minerals. That's why a law suit has been filed against you and other heirs that refuse to sign leases with ARC. No you don't have to lease to ARC! However, because you don't hold 100% ownership of the minerals in question you are denying other heirs the full benefit of their mineral estate. The bottom line is you will lose the rights to these minerals if you don't comply to the leasing agreement.