My fiance's aunt & uncle have three children who are 15, 18, and 20. We are inviting them all, but not letting the cousins bring dates to help keep the number down (none are in relationships). Is it wrong to address the invite to the whole family, or since they are older, is it proper to send one to his aunt & uncle, and one to each cousin? They all live together so I'm hoping it's ok to just address it to the family. Please help!