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Brothers is the plural form of brother.
Brothers, The Brothers Grimm, The Blues Brothers, Four Brothers, Step Brothers, Seven Brides for Seven Brothers, The Brothers McMullen, The Brothers Solomon, The Brothers Karamazov, The Brothers Bloom, The Corsican Brothers, ...
Brother's is singular possessive. Brother is singular and brothers is plural.
The plural is brothers.
brother
brother's
The husband's brother is a brother-in-law to the wife. The wife's brother is a brother-in-law to the husband. However, the husband's brother is not related to the wife's brother.
It all depends on how many brothers there are. If you are talking about one brother, it will be " brother's ". EG: "I have two siblings, both fond of cycling. My brother's bike is made of cheese. My sister's bike, on the other hand, is not green." If you are talking about several brothers, it will be " brothers' ". EG : "My brothers' girlfriends all wear pancakes for shoes." (what are the odds?!)
Brothers become blood-related brothers if they are born to the same 2 parents. A brother can be adopted and become a brother. Brothers are step-brothers if one parent of each boy marries the parent of the other boy. Brothers can emotionally become 'brothers' when two people are friends but they have no family relationship between them.
I have one brother
The plural of bràthair (brother) is bràithrean. (This would not be for the surname Brothers.)
Jacqueline Kennedy did not have brothers. She had a step-brother, Yusha Auchincloss, and a half-brother.