Okay so I'm working on addressing my wedding invites. I have a couple of adult cousins unfortunately still living with mom & dad. I've read many wedding etiquette website stating that anyone over the age of 16-18 should receive their own invite. Yes I understand that but I'm trying to keep my guest list down and If I send them their own invite I feel like I have to include a guest for them. I don't want them to bring their boyfriend/ girlfriend of the week, someone that I'll probably never meet again, let alone pay their way. Obviously if they've been with their significant other for several years and the entire family knows them then I would invite them. But back to the fact of the matter if their 25 and living with mom and dad can I address the outer envelope as.
Mr & Mrs John Doe
& Family
and then on the inner envelope be more specific
Uncle John & Aunt Kathy
& Cousin Mike
I figure why waste a expensive invite and send more that one to the household when they'll probably only keep one and throw the other away??