Your comments are generally civil and thoughtful. I completely understand your frustration at being down voted, and unfortunately there are some users here (on any side of any contentious issue), that do down vote because they disagree, and there have been comments (including Paul Graham) that support the idea of using down votes to show disagreement. I also have seen that a lot of people don't agree with this practice.
That said, I don't think calling out your parent for down voting you is constructive. For one, voting is anonymous. And the fact that you're engaging on the site indicates to me that you actually want to have a conversation. Accusing someone of censoring you is only going to be inflammatory.
It's not fair, I know. Keep fighting the good fight. Keep posting civil and thoughtful comments. Work to understand and be understood. Help keep HN a good place for useful discussion.
By the way, I'm writing this as much for you as for me. I'm reminding myself of how I want to engage. There's so much acrimony and polarization. Figuring out ways to reach compromise and agreement is crucial.
Thanks for taking the time to read through this :)