I have a question about Steam Family Sharing and using DLCs. I already own a DLC for a game, but this DLC requires another game to function. However, I do not own the required base game on my account. If someone in my family buys the required base game and shares it with me, will I be able to activate and use the DLC? Or do I need to purchase the required base game on my own account to use the DLC?

Specifically, the DLC I own is Total War: WARHAMMER II - Mortal Empires and I need to have both Total War: WARHAMMER II and Total War: WARHAMMER I.