While your dad may be perfectly legal depending on the state you live in, in allowing YOU a cigar and a beer, he may be breaking the law if he supplies your ‘good Catholic young/underage’ friends with cigars and especially beer. I mean, seriously breaking the law.
I’m probably even older than your dad and stricter, so I can weigh in on this. It is my experience that the stricter and more ‘holy’ we think we are, the more we view ‘breaking the rules’ as something that we’re entitled to do. Because we tend to think, “We are much better than the world with raising our kids with good values, so when we think the world’s ‘petty’ laws are ‘stupid’, we’re not doing anything ‘wrong’ in breaking or ignoring them.”
I was lucky enough not to do anything stupid before I got smart, but that was the grace of God, not the brain of me, that saved me.
You don’t need to tell Dad, “Dad, you’re wrong”, but you can refrain from crystallizing him into thinking, “Dang, I’m the best coolest dad, I give my son things he WANTS” by next time he thinks he wants to ‘treat’ you with, “You know, Dad, cigars are great and we know how to handle them, so for a treat, I’d really like to take some money and donate to 40 days for Life”, or “Hey dad, let’s take the Exodus 90 challenge”.
Yes, you need to worry about God’s law (and while you’re letting Dad play the cool parent and him putting your mother in the position of the tyrannical, overbearing worrywart, that is NOT part of God’s law and it’s very unfair to you and your parents), but worry about your ‘state’ law as well. If your dad winds up being charged with supplying liquor to minors, it’s really serious.