Video footage of the brawl at the Ramada Hotel in Wolverhampton last October went viral.
Three people were taken to hospital with injuries and police were called but no arrests made.
Family members of the bride and groom have now threatened to sue the hotel for an alleged breach of privacy, claiming staff filmed the fight and uploaded the footage on to social media, and say there was a lack of safeguarding at the function attended by 500 guests.
The hotel strongly refutes the claims.
The family has formed The Ramada Injured Party Action Group, demanding an apology from the hotel for its alleged failings on October 12.
The group claims to have received a bill for £85,000 to cover damages but the hotel described the figure as “ridiculous”, adding it was nowhere near that amount.