I am wondering the etiquette for inviting a coworker's children (one is in high school and one in college). I have never met the children and I'm only having a 100 person wedding. I am inviting children from my family, however. Do I need to invite their children as one is an adult and one will be in high school at the time of the wedding? 4 people for my 1 coworker seems like a lot for my 100 person list