A Lannister always pays his debts

When Tyrion walked away from his sibling's bodies he knew he wasn't going to let that be the end for them. In Winterfell, Jaime had finally forgiven him. Cersei had never shown an ounce of kindness towards him, but he child she carried was innocent. It didn't deserve to have died in the womb like that. Tyrion Lannister was going to bring his siblings back. Back from the dead.