I am also a landlord. I give you a suggestion.
All Chinese are not easy here in Canada. They like to eat, you like to eat, I like to eat. Everybody likes to eat. This is Chinese culture. Eating outside is too expensive. So DIY at home is the only solution. But if you think they have get together too much and too often. So I think you should just tell them what you think frankly and directly. But make sure in a friendly and polite way. If they can accept then the problem solved. If they can't accept, then you can ask them to move. Again, you should talk to them in a nice way.
I have never had any this kind of problems with my tenants in the past 5 years.
My experience are:
1. Chose tenants first. I only rent to those polite people who
keep promise and keep on time.They are willing to sign
agreement with me.
2. I always sign a detailed rental agreement with my tenants
and get a photocopy of of tenents' ID( passport of drivers
license). Getting a copy of their ID is a very important factor
to get good people to live together under the same roof.
3. Make sure that the safty deposit is a DEPOSIT, not last
month rent. The DEPOSIT will only be returned to the
tenants on the day when they move out.
4. Taking them as your business partner. ( Renting is a
business. You are doing business with your tenants) So you
have to take good care of them. Try your best to help
them. You help them you keep the good business. I am
sure they all need someone to help.
You should not share kitchen with others. Why don't you make another simple kitchen for your tenents so long as you want rent rooms out? It is very unconvenient to share kitchen with others especially when you have kids.
Just for your reference.
It's simple!
Tell each other what you like and what you don't like. If each side can accept then you can keep renting to them. If not tell them to move. But make sure in a nice and polite way and give them one month to find a new place.
The good and peaceful solution is to drive them out as early as possible because you are not able to change their life style and you are not expecting to face a more serious problem when you have suffering enough from them.
Anger comes from even very nice person when he or she suffers enough.
Anger causes burning fire that might burn the house.
So put this into action: they must go by next month.
房东的烦恼：我家的租客老在聚餐