[@Gunther] Carlton was Renault's brother that died in Robert's Rebellion. My apologies if that wasn't in the details so an eldest son is still available unless [@Nightwing95] has taken that spot. The heir can be up to his early twenties, since Renault and Lucia were married young. Remember that lower knight houses would marry thier daughters of for prestige, so a Samwell character is plausible but he might be overlooked for a younger son that might be a better heir.