"Shunning a myth":
- It's a myth that a disfellowshipped witnesses wouldn't be invited to her brother's wedding (the invitation would be sent shortly before the event, so if the DF'd sister can afford a next-day plane fare and can find an available seat on a busy weekend, she might even be able to accept that invitation on such short notice).
- It's a myth the disfellowshipped sister wouldn't be allowed into the Kingdom Hall if the last-minute travel arrangements came through. (She could enter moments before the ceremony starts, sit in the last row to avoid stumbling others by scandalously sitting with the rest of the family, and is expected to leave promptly the moment the ceremony ends).
- It's a myth that the disfellowshipped sister would be completely ignored at the reception. There could be some "urgent family business" that would allow at least a moment of interaction. (Accepting a gift, for example: a wedding being one of the few times Witnesses are allowed to give and receive presents.)
Watchtower-sanctioned shunning is not mythical, it is legendary!