Hi, I am a beginner in astrology but I thought maybe I could offer some advice:
Saturn is the planet that limits us, so in a way it is like your Saturn in Gemini limits your husband's sun in Gemini. In the relationship you are probably the voice of reason or the responsible one.
In a sense your Saturn is "a rain on your husband's Gemini sun's parade" .
You probably won't feel the effects of your husband's saturn in Gemini unless you too have a sun in gemini
It is not an end all of a relationship, it just takes some work. My advice would be to learn to at least humor some of your husbands ideas
It doesn't mean there is no way for you two to get along. There may be many other aspects in a chart that point to a great relationship, it's just this one is a bit of a challenge.
I can relate because I had Saturn in Capricorn conjunct my partner's Capricorn sun- i always felt in ways like the mother in the relationship