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A: If that is the rule, then you should respect your parents. The Protestant church service doesn't fulfill our Sunday obligation as Catholics. They don't have the Eucharist. The rule around my house (because I have a lot of Protestant friends) was that I had to go to my church first, fulfill my obligation, and then I could go to my friend’s church. You should also be able to defend your faith if you are ever put into a situation at your friend’s church that would call you to.
Ashley