I feel like this has been answered before, but I can't find it, so please bear with me.
I'm starting to address my invites, and something feel weird about writing "Mr. and Mrs. Dad RWolff" for my parents, and for many other relatives. Is it awful to adress them as "Mom and Dad RWolff" instead? Not just for my parents, although that's the example that feels the strangest.
As I understand it, not using titles indicates a less formal wedding. Any other reason to stick with it? I actually write letters to friends and family fairly often and never use it. Although I realize a wedding is different, it feels very odd and somewhat antiquated, unless I'm missing a good reason for it.