Kidney Failure Hot Tubs How Can I Get My Downstairs Neighbours To Be Less Annoying Without Starting A War?

How can I get my downstairs neighbours to be less annoying without starting a war? - kidney failure hot tubs

I live in a duplex (top and bottom). The place was formerly a home for single use, so we can share the heat and hot water. This is a non-smoking suite.
We offer our friendly neighbors garage, despite paying more, and have a superior suite.
We are in our 20 and are in their 50s.
He is a married couple and 2 of his friends.
She works part-time and the man is suffering from lung cancer and kidney failure. Continue smoking in the garage with the door open for the Main area. Therefore, our apartment feels NON-SMOKING.
They have a very energetic dog who never leaves a cry for ever.
Listen to country music loud in the garage is located right in our living room, you can not watch TV
How can we tell them that, being younger, their behavior is out of line and be taken seriously?