What bothers me about what your RC guests did is that they didn't have the b*lls to tell you either by phone or via letter of their intentions and reasonings. As I mentioned in one of my posts, I HAVE heard of
strict Catholics not attending this type of wedding. But usually, if someone is THAT much of a strict adherent to religious law, they will have no problem telling you to your face why they refuse to attend your wedding.
I want to clarify because I think a few Disboard members don't understand the issue at hand--The issue is not that they would be attending the wedding of a non-Catholic, as I think one poster mentioned--yes, a Catholic can attend any wedding. The issue is that of the "invalid wedding"--attending the wedding of someone who is still officially a member of the Catholic Church, but is choosing to get married outside a Church in a non-Catholic ceremony. Roman Catholics are required to get married within the Catholic Church in a Catholic ceremony, and if they don't, they must either get a blessing beforehand (with all the baggage that that entails), or formally leave the Catholic Church to have their non-Church wedding.
I know that most of us who are sensible and easy-going look at this and think, 'What the hell is wrong with these people? They should just be happy for you, etc.' but as painful and frustrating as it is, you just have to accept that there are just many people who adhere to VERY strict religious beliefs, and they don't bend for ANY reason whatsoever. For these people, religion is more important than the people in their lives. As "religious" as your DF's relatives think they are however, I believe they will regret later in life not celebrating your marriage.
Personally, I think it's a TOTAL load of bullsh*t, and all it does is give other people an excuse to be judgmental and self-righteous. Most of the weddings I have attended in my life have been these kinds of "invalid" weddings, and according to the rules, my own wedding will be invalid too, but this is how I'll be sleeping at night....
1.) Don't sweat the small stuff...
2.) Everything is small stuff...
The RC relatives can snivel and sneer all they want... Your wedding and marriage will be FABULOUS