She’s Keeping A Secret From Her BFF-Other People’s Problems

On Other People's Problems, a woman has a secret that she wants to keep hidden from her best friend, especially on her wedding day. She needs advice on how to disguise her situation.

Mike & Kate-
I am the maid of honor in my best friend's wedding later this month. She and I have been best friends since we met in college. We are both now in our earlier 30s. She is more like my sister. We've spent holidays with each others' families. I spend a ton of time at her family's home in McCall in the summer. And her fiance is amazing! They've been dating for 5 years and I couldn't be happier for her.
My personal life is a little messier than hers. That's where my OPP issue comes in. I'm in love with her dad. I never meant for this to happen. He and his ex wife have been divorced since before I met my BFF. Like I said, I've spent a ton of time with this family. I never developed feelings for him until about a year ago. It was weird, we were all in Tahoe and I suddenly saw him in a different way after skiing with him all day. My BFF and her fiance kind of ditched us so we spent more time alone than usual and something sparked. It took months for us to admit we had feelings for each other. When we were around each other the electricity was undeniable. I was worried back then about what my feelings would do to my friendship. After about 4 months of innocent flirting and being unable to control our attraction we kissed. We started seeing each other regularly and now a year later we're in love.
We have been able to keep this relationship a secret out of fear how his daughter and his other kids will react. We also thought there is no point in upsetting anyone unless this is the real deal. We think it is, but want to make sure. If we end up breaking up then we upset the family for no reason.
I've been able to avoid most family functions with the excuse that my work schedule is insane. I didn't want to run the risk of having my BFF pick up on anything between her dad and I.
With her wedding coming up, we will obviously all be together. I'm worried that everyone in the family will be able to tell that we're in love.
My question for OPP, should we each bring a "fake date" so that no can pick up on our relationship? I would be devastated if I ruined my BFFs day. I want her to find out about her dad and I at a more appropriate time.

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