It usually goes better than you expect. I think your significant other might want to tell his family a bit about you so they don't ask too much.

He might also tell that you are nervous meeting them. I warned my family that my fiancée (bf at the time) is nervous meeting them so they were gentle. If you two have great relationship otherwise then that's what matters. You can discuss it ahead of time. I am not nervous meeting anyone or talking about anything but my fiancée is so I supported him through it and he survived lol it gets easier

I have to add that my fiancée has Tourette's and it gets worse when nervous. My family doesn't care about it. He actually tells people up front so won't get shocked

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