Three brothers

Brian, Peter and Steven were three brothers very close to each other. The brothers always went to a local bar on every Saturday at 5 pm. When the brothers got married they all got married to their wives to be on the same day and at the same place. When the brothers moved away from each other to go on with their lives with their new
wife, they all promised each other that they would still go to the bar every Saturday at 5 pm and drink for each other. On the first Saturday that the brothers were separated, the first brother, Brian, went to the local bar and ordered three drinks. He took one sip from the first glass the took one sip from the second glass then
from the third. He did this until all the beer was gone, then he paid the bartender and went home. This kept up for about three week before the bartender finally asked why he did that. Brian explained about the promise that he had with his brothers. The bartender said that he thought that was a very good promise to keep with each other. One day Brian came in and asked for only two glasses of beer. The bartender thinking something awful has happened, said "I am awfully sorry about your brother". Brian not knowing anything about what the bartender was talking about asked "What happened to him?" The bartender said that when he only ordered two drinks instead of three he thought that something awful had happened. Brian replied "No, nothing happened to my brother, I just decided to give up alcohol."