One person cooking a Thanksgiving dinner for 26 people is absolutely asinine.
Hosting the entire family for the holidays is no small task. Even if you’re just hosting your nuclear family plus a grandma and grandpa, you still have a whole house to clean, decorate, and a clan of hungry people to cook for. It gets a lot more complicated if you’re an adult with brothers and sisters who all have families of their own and all want a plate. Cooking for six people is one thing, but 26? You might as well just order pizzas and forget the whole thing if you have to cook a Thanksgiving dinner for that many people.
Reasonable families try to share the love. They assign dishes to different family members, who bring the dishes to the function, so that no one person is saddled with cooking six different Thanksgiving side dishes. This works if all of the extended family is willing to do that little extra work to make it happen, but when family members are selfish and can’t be bothered to make some mashed potatoes, the job falls onto one or two people.