Whatever they want to be called.
Sure, calling a senior individual by their first name when uninvited is disrespectful. When meeting a friend or girlfriend's parents, I always start out with Mr. or Mrs. (or Ms., if appropriate) X. If I'm uncorrected, that's what it stays. If, however, I'm asked to call them by their first name, I reckon it would be a greater disrespect to go against their wishes.
All in all, it's not generally that big a deal. Just do what comes naturally.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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