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Son In Law Of Discord is a sequel to Daughter of Discord and is written by DisneyFanatic2364, consisting of nineteen chapters.
Now that Prince Mothball has gotten used to living with the Discord family, he thinks he is ready to take the next step with Screwball. However, their plans are put on hold when the changelings return and want Mothball to be their king. That is the only way for the changeling hive to reproduce except for another difficult option. Finding Mothball's sister, Bellatrix which he never new he had. Mothball, Screwball, and Twilight Sparkle venture off into Equestria when they reach Canter Creek. The three find Bellatrix disguised as Trixie, who was a pony that Bellatrix made up so she could do stage magic. Trixie and Iron Will had given birth to a changeling/foal/minotaur and her name was Moonbeam and Iron Will ran away when Bellatrix showed him she was a changeling.