On the book, we learn about Grover Tully, the head of House Tully, as well as his grandson Elmo Tully. Elmo has two sons: Kermit and Oscar Tully. House of the Dragon seems to have cut out Elmo.

HBO's House of The Dragon shows that the Riverlands are continuously caught in a conflict, the latest of which is the Targaryen civil war. There are many houses in the Riverlands, and because they ...