I told them that I am against gun-control and think their way of thinking is bad.[/QUOTE [emphasis added]]
In my experience, telling an anti--and this would apply triply if it's your parents--that their thinking is bad is never going to get you anywhere and usually creates more negative feelings than anything else.
But let's get to the heart of this. Thanksgiving is a time where we set aside to give thanks for those things which provide for us, keep us safe, and give our lives meaning. Your insistence on carrying a gun into your parents house, and refusal to enter at all without one, demonstrates that for which you're thankful, and it isn't them. It is a blatant statement on your part that:
- You think what matters to you is more important than what matters to them, even in their home.
- You don't appreciate all the years your parents fed, housed, and clothed you and wiped your behind when you couldn't do so for yourself.
- You don't feel safe in your parents' home.
- You're more thankful for the Second Amendment than for your parents' love and nurture.
- You prefer the company of your gun to that of your parents.
- You love carrying a gun more than you love your mother and father.
Evergreen, this is what you've left you mother and father thinking. I could go on with the list, but if that's not enough to make you feel ashamed of your attitude, there simply isn't enough. And your brother is going to be there, a brother you haven't seen in two years! Seems you love your gun more than you love him as well.
You asked for thoughts and advice on this, so here's mine: Man up. Apologize to your parents, and mean it. Recognize that you'll lose them one day and you'll realize too late how unloving of them you were being. Honor the invitation for Thanksgiving. Disarm (and I mean really disarm--no sneaking in a pocket .380 thinking "What they don't know what hurt them"), and enjoy the warmth and comfort of your parents and their home. Pray in thanks that you can go be with your parents on Thanksgiving--many of us can't.
If you don't think you can feel comfortable disarmed, I suggest you practice. Spend time each day between now and then without your gun. It is surprisingly easy once you remember that your situational awareness and proactive decision making are far greater contributors to your security than a firearm will ever be.
You say you're in your thirties, not some college kid on holiday break? I say you're acting very childish for a man of that age. The young people I teach and lead in my church are 5th grade through high school, and they all exhibit more wisdom than you're showing here.
If in the end you decide you simply cannot disarm for the weekend, seek psychological help. I'm not being sarcastic in any way when I say that.