We have a couple in our church, one Catholic and the Orthodox, but both are active in both churches. The husband (Catholic) essentially pulls off our entire Greek Festival himself, helping to raise $150,000+ each year as the head cook/organizer. And I've never of anyone even commenting on the difference in religion, even though they were both married in an Orthodox church.
I know that in my family, nobody is interested in converting at this time. My mother comes to church with me every Sunday (and even by herself when I'm not there), but still is reserved about "signing the contract" as she puts it. Most of them have never belonged to an "organized" church-going religion, and the closest thing we had prior to that was Quakerism, which my grandfather left to join the Korean War.
So although they all agree with the theology, the Maine-mentality creates a barrier of joining any large group. It's just the way some people are.
I realize it may be hard to be the only one in the family who chooses Orthodoxy, but that does not mean you should love them any less, as time may bring them around. As long as they are fine with it, I'm 98% sure your priest will have no qualms.
Hope everything works out for the best.