Thread:Fearless Diva/@comment-34296592-20181222134932/@comment-33834897-20181223095453

Definition: A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law.

So, MC must be married. But I think it is very safe to assume that they will be married even if not mentioned. I doubt they will stay BF/GF for life.