The other two people may go out to eat because the food doesn't taste good. After a long time, they want to change their taste. You can ask other brothers why they go out for dinner. Any problem can be solved.
Cooking by yourself is a good way, which is cost-saving and hygienic. I suggest you communicate with each other, or ask them to give you advice to improve your cooking level.
Everyone is depressed at times. You solve the problem actively, and it will pass.