For example, if the children are over 18 and still live with their parents? What do I put on the outer envelope and what do I put on the inner envelope?
Also, what if the kids are under 18?

I believe when you write Mr. and Mrs. Justin Example and Family covers all the unmarried children. If Mr. Example has a married son/daughter and you would like to invite them too you have to make a separate invitation as they will be another family. Also if they have children who no longer live in their home you may want to make a separate invitation.

I always send separate invitations to those who are over 18. They're adults now. Kids under 18 can be included in invitations to parents. You can either address them by name or use the phrase "Mr. and Mrs. _________ and Family."

If they are over 18 then they should definitely receive their own invitation whether or not they live at home. Under 18 should be included in the parents invite..I believe.....I guess it would fall under Mr. & Mrs. SoSo and family

Mr & Mrs John Smith and family covers all the basis simply & effeciently.

I wouldn't waste a separate invite on kids over 18 living at home unless you want them to bring a guest.

On the outer envelope:

Mr. and Mrs. John Smith and Family

On the inner envelope:

John, Jane, Susie and Tommy

If all else fails, talk to them like adults. If anything, it's respectful

best wishes.

I think you should make a seperate invitation for each person invited. Each person is an individual and you should be honored they may be inclined to take time out of their busy schedule to wake up early and get dressed up just to make an appearance at a wedding for someone who mosy likely is not on their high priority list. Stop worrying about invitations and start thinking about the future.

i think you would have to figure out i you want to send the over 18 kid their own invite or not. it is also appropriate to address it to "mr and mrs blah blah and family" if younger kids are invited.

you should check out some wedding planning books as these usually have sections on invitation ettiquette

For under 18 boys are addressed as Master and girls as Miss. Ex: Master Johnathan smith etc...