These are the people that are invited to the wedding, the people listed on the inner envelope. And if there isn't an inner envelope, it's the people listed on the outer envelope.
That means that if it just says Tammie Jones, Tammie is the only one invited to the wedding, not her boyfriend or her kids.
If it says Tammie Jones and Billy Joe, that means that Tammie and Billy are invited, not their kids or their kid's kids.
Don't try to bring or invite a guest if it doesn't say "and guest" on the invitation, the bride and groom (or her parents, his parents, whoever is paying for the wedding) is paying a good chunk of change for you to attend their wedding. Don't force it.
It's just not good etiquette, its not fair to put the bride and groom in that situation.
