How do you handle family members who mock your faith?

My dad keeps making jokes about church and calling me 'pastor' whenever I mention Bible stuff. My brother literally rolled his eyes when I said grace before dinner last week. I don't want to be preachy or annoying but I also feel like I'm supposed to be bold about what I believe. How do you lead by example without being that guy? How do you stay confident in your faith when your own family doesn't get it?