That's true. I've had an experience. A very painful one in my family. We're Jewish. As long as I can remember, my parents told us that if we marry out of the religion that's it. There was a time that it was drummed into our head that if you marry out of the religion, you're fulfilling Hitler's wish. I learned that at the age of 8 in Hebrew school. AND WE WEREN'T EVEN RELIGIOUS. My mother was brought up orthodox, my Dad was brought up nothing. But he had a very strong sense of Zionism, which came to him later on in life.
ANYWAY, my brother announced one day he was going to get married, and she wasn't Jewish. This was in like 1970. He was the oldest...my parents didn't got to the wedding and they didn't speak for years, My brother was the favorite child (and I have no problem saying that, because he was quite remarkable). It was devestating on the entire family. My other Brother and I were allowed to make our own choices and we went to the wedding and kept in touch with my Brother.
Years went by, but my parents finally did reconnect with my brother and his family. This was a good thing, because my beloved brother passed away from lung cancer at the age of 42.
Policies of absolute intollerance never come to any good.
Egads! What a story!
It surely was painful to all involved.