I have this discussion beat.
My mom is Orthodox, good Greek girl. My dad is a staunch German Lutheran (LCMS). He went to a Lutheran high school right next door to the Orthodox church my mom attended (the same one where they would get married and I would be baptized in). Both had been married previously (Dad to a Lutheran girl right out of high school and Mom to a short, bald Greek guy). Of course, when they began dating, they agreed and understood that the kids would be raised Orthodox, because, you know, "Yes dear". Coincidentally, my dad later told me that he had a teacher who said, "The worst thing a Lutheran could do is marry a Catholic," which is pretty much what he did when he married my mom.
But, I spent most of my childhood in Montana where the nearest Orthodox church was two hours away. So, for two Sundays a month I attended my dad's LCMS church. I attended their Sunday School and Bible Studies. I was, unfortunately, lumped in with the Lutherans when I ran into those kids at school, "Oh, he (me) attends my church (LCMS)."
Anyways, I still evangelized to the Lutherans. In fact, my best friend at the time, began his confirmation classes a year early at 6th grade. So, I attended some as well. One class I was invited to speak on Orthodox; I was 11 and in fifth grade at the time. In a prophetic twist, I attended a Lutheran University years later with a strong Pre-Sem program. Being raised among Lutherans has allowed me to 'talk the talk', but I still enjoy a good Lutheran joke now and again.
In Mid-May, I'll even be visiting some friends down in St. Louis. We'll do the usual routine: Drink beer and discuss theology.