Welcome, killer. Don't you just hate people who do that? My advice to you is to flip the coin. On the other side you will find all the wonderful things you will be able to eat. And if you cook or bake, that number automatically doubles or triples. There is a recipe section here. Feel free to browse it
And I don't know if you feel like you could do this, but if I were in your shoes I would be telling them they better start cooking better, and give them a diet which you can download from any Bariatric Hospital site, which has instructions and amounts and list protein grams. You can cook these for them and teach them to cook them for you. Obviously they feel threatened by your decision. That's just their tough luck. It's not like somebody has an Uzi trained on them. Stay strong and stay connected. We love you here and we are going to support your dietary choices and your journey. It means a lot to all of us.