You state that you suspect that some of your family members are aware of your sexual orientation. You have the right to invite anyone you wish to your social gatherings, but having done so, you shouldn't attempt to censor who they are.
You are not obligated to invite this couple to your wedding. Write them a sweet note explaining that you are sorry you won't be able to attend because you will be on your honeymoon at that time.
Amal Clooney stated guests at her home must surrender their phones to maintain privacy. She emphasizes the importance of meaningful interactions without digital interruptions, especially as parents.