If you’re open to suggestions: Stop doing this! They are grown men. They aren’t little boys anymore. Intergenerational living is fine, but they’re not living like grown men. They need to take turns cooking, cleaning, etc. To start, each of them can be in charge of dinner twice a week, and the other does the dishes. They need to do their own laundry. They’re never going to live adult lives with partners if they don’t make changes.