I'm the only real nerd in my entire family that is falling apart.
Sounds exactly like me. It's scary, really.
My father disowned my sister for no reason other than she phoned the police on him because he was breaking stuff in a fit. My brother has been engaged three times in a 6 month period, picking up whatever white trash whore that gives him a couch to sleep on. He's an alcoholic that can't take care of his children.
Every family has bad eggs, my advice is to focus on strengthening your bonds with the good ones. My sister, for example. Well-liked and loved by all, the only one in my family to go to college full term & the only one in my family to land her name & picture in the newspaper...for her field studies...not a crime. I don't even talk to my dad or brother unless they talk to me. Nobody even invited me to Thanksgiving and you know what...that was fine with me!!!
I focus on taking care of sister, and my girlfriend. I spend more time with her family than my own. We even invite my sister to their Christmas, and holiday stuff so she's not left out of anything (well she has a boyfriend too and goes to his stuff).
As far as friends go, I literally wouldn't have any if not for Magic the Gathering. My nerd level is over 9000. Before I started playing the game, I rarely left the house and just had my internet friends that I met from video games and forums. I hung out occasionally with co-workers, but you know, that was more of I have nobody else.
Does your husband like anything nerdy? I find that board games are pretty amazing and have opened people up to trying nerdier stuff. Years ago we started hosting 'nerd nights' and more and more people eventually showed. Lots of movie themed board games out there that are pretty good. Firefly, Battlestar Galactica...if all else fails bust out Cards Against Humanity. Then I got people to try D&D and we had a group going for awhile before RL took over any viable playing times. Hobby shops are a great way to meet people and hang out. Always people playing TCG's and tabletop games there.