The correct grammer would be "the family invites you". "Family" is singular in American English, and therefore should use the singular form of the verb.
It depend on how the user intend to use the sentence and so both are correct in the sense that when using it for a single person, it will be ' the family invite " and when using it for two or more or...
I was in the exact same situation! I really caused a scene... Here is some of my hind sight to help you out! Deal it with it with the biggest smile you can manufactor... That would aggrevate them...
Etiquette states that the bride and groom's families can invite the same amount of guests. However, depending on the finances of both parents (especially the bride's parents) it's wise for both sets...