My daughter is getting married in a very small ceremony and reception. Family only (and it's a very small family), plus 1 friend and their spouse for my daughter and 1 friend and their spouse for her fiance. From daughter's side will be 2 aunt's, their husbands, 1 cousin and his wife. From his side are his sister, her husband and 2 daughter's, ages 9 and 12, sister's husband's daughter from a former marriage, age 16, and sister's husband's parents. The problem is the sister's husband's daughter. My daughter does not have a relationship with the 16 year old, and her fiance only knows her in passing. She has had several boyfriends during my daughter's relationship with her fiance, and fiance's brother-in-law wants his 16 year old to have a +1. 16 yo lives with father part-time, and the week of the wedding will be her week with her father. There are no formal invitations, but if their were, I would think that since she is not an adult child she would not get a separate invitation. Should a teenager's boyfriend attend? If so, at what age does the +1 countdown start?