My brother is in the middle of college and been dating a girl now for a year. My mom says they're pretty serious and I was planning on inviting her even though I've never met her. It's a DH wedding with only 18 guests. My MOH was shocked that I would consider inviting her because they're only in college, not living together (dorms), and are not 21 (nor will be by the time of the wedding). By the time of the wedding they'll be together for 1.5 years and def be considered a couple. Invited/STDs not out yet, but am I in the right for including her? Is my MOH right? Or does it really not matter?