@Thomas ******
You *may be* able to get another 1 year extension of stay based on marriage by doing this:
1. Go to your local immigration office, and request a 60 day extension of stay based on visiting Thai family. *IF* they sell you that extension of stay, it will put a "hard stamp" in your passport.
2. With that "hard stamp", you can then apply for a one year extension of stay based on marriage to a Thai national.