Gorman Brothers

In Majora's Mask, the Gorman Brothers (ゴーマン兄弟, Gōman Kyōdai) are three brothers that resemble Ingo from Ocarina of Time. Two of them, referred to as the Gorman Brothers by the Bombers' Notebook, are found on a racing track near Romani Ranch called the Gorman Track, while the other one, known only as Gorman, is the leader of the Gorman Troupe.

The Gorman Brothers
The Gorman Brothers at the Gorman Track are known to be corrupt, malicious, and dishonest people who are willing to do anything in order to take over the milk business and harm those competing against them, specifically, the owners of the neighboring ranch: Romani and Cremia. The brothers have been making the life of Romani and Cremia impossible by doing various mischievous tasks in order to hinder Romani Ranch's business. The two brothers are the ones responsible for blocking the path to the ranch with a giant boulder, preventing their delivery of milk to the town's Milk Bar. Moreover, it can be assumed that the mischievous Gorman Brothers have also been breaking the bottles of milk produced by Romani Ranch, although Cremia is not aware of who is responsible for such actions.

The two brothers treat rudely those who show themselves up to the Gorman Track with no horse. Moreover, they continue to demonstrate their malicious intents by suggesting that if the visitor is in need of a horse, they could just steal a horse from Romani Ranch since they would probably not even notice. They also sell milk for 50 Rupees and mention that the milk produced in Romani Ranch is watered down and not worth drinking, while saying that theirs is always fresh and full of vitamins.

When Link first meets them, they treat him with a cocky and arrogant attitude as they make fun of the size of his horse. They challenge him to a race for 10 Rupees, confident that they will win. When Link beats them, they hand over the Garo's Mask as long as the young hero promises to not tell anyone where he got it from.

If Link helped Romani defend the cows from Them on the night of the First Day and accepts to accompany Cremia on the milk delivery to town on the Second Day, the ranch owner and Link discover that the road to Clock Town has been blocked, most likely due to the Gorman Brothers. As such, they are forced to take a detour through the Gorman Track. The Gorman Brothers, wearing the Garo's Mask while riding on their horses, chase the wagon and try to break the cargo of milk bottles that Cremia is trying to deliver to the Milk Bar. Link chases them off using his bow and arrows, and the pair is able to escape the Gorman Brothers without any major harm done. However, if Link fails to protect the milk from the bandits, the Gorman Brothers will have taken over the milk business by the Final Day.

If Link talks to them using the Circus Leader's Mask, the Gorman Brothers will get sentimental and talk about their younger brother, Gorman. They will even show a sign of remorse for all the malevolent deeds they have done, but then mention that they can't get emotional over such things; thus, they ask Link to stop making them feel uncomfortable and take the mask off.

Gorman
The middle sibling of the Gorman Brothers, Gorman, seems to be kinder and more benevolent than his brothers, despite that he might not show it when Link first talks to him. Unlike his brothers, he was no good at handling and taking care of horses, so he left the ranch life to join the world of show business after hearing the mother of Lulu sing the famous melody of Ballad of the Wind Fish.

If Link comforts him by playing the Ballad of the Wind Fish, he gives the young hero the Circus Leader's Mask as a reward for helping him remember why he joined the world of show business.

Theories
Judging from the reaction of the Gorman Brothers after the aliens attacked Romani Ranch, it can be assumed that they were also responsible for the invasion of Romani Ranch. The Garo's Mask, which both of the two brothers have, is used to summon Garos; it is possible, therefore, that the Gorman Brothers were trying to eliminate their competition by using the power of the Garo. It as equally as likely, however, since there is no Garo activity in the Milk Road area, that the Gorman Brothers are simply using the disguises as a form of scare tactics.