My first-cousin is getting married in August, and I have a plus-one etiquette question. I am 25 years-old (going to be 26 in three months). My partner and I have been together for two years, and in March, we moved in together. My mother recently called to tell me that wedding invitations came to their house. I didn't receive my own invitation - but my name was merely attached onto my parents invitation (i.e., "Mr. and Mrs. John Smith and Mary"). The next day, I found out via my aunt and mother that my partner is not invited to the wedding because we are not engaged or married. Apparently, my cousin and his wife-to-be have a total of 50 friends coming to the wedding, and if all received a plus-one, it would be 100 guests, not including family. So, they decided to only give a plus-one to guests that are engaged or married, and everyone else is expected to come alone. This is extremely irritating to me. I can understand not giving a plus-one to those who are single, or those who are who simply dating someone, but not giving a plus-one to people in a long-term relationship and who LIVE together? My mother suggested that I call my cousin and wife-to-be to see if my partner can come. If not, I feel as though I will not attend the wedding. I am always included / invited to everything in my partner's family, and I would feel like complete crap saying, "Sorry, sweetheart, but I'll see you on Sunday evening. And hey, make sure you remember to clean the bathroom and do the laundry while I'm gone!" (the wedding is three hours away, so it is an entire weekend affair). If I do not come, I know that it will likely cause a heated argument with my parents, and that my aunt, uncle, and cousin would be disappointed. However, I am an adult, in a two year relationship with the person I plan on spending the rest of my life with, and we live together. Why should I have to go to this wedding alone, get a hotel room alone, etc.? I would appreciate your advice and thoughts on how to handle this situation. Thank you!