I don't want my son to start drinking coffee at such a young age so I'm going to ask my brother to stop drinking it around him.
Do you think your son is interested in drinking coffee?
Not yet but if he sees my brother drinking so much of it, he'll want to start. He thinks my brother is very cool.
Wanting to create a safe and healthy environment for your child is completely understandable. It makes sense to want to set some rules for other people to be around your kids. Hopefully your brother takes them seriously.
I'm sure he'll listen to my wishes. He usually does what I ask him to.
It's good that you and your brother have a good relationship and he'll respect your wishes. Having rules for people to follow around your children helps to keep them exposed to positive influences.