As interjections the difference between welcome and brother
is that welcome is Greeting given upon someone's arrival.brother is Expressing exasperation.
As verbs the difference between welcome and brother
is that welcome is to affirm or greet the arrival of someone, especially by saying "Welcome!" while brother is to treat as a brother.
As nouns the difference between welcome and brother
is that welcome is the act of greeting someone’s arrival, especially by saying "Welcome!"; reception while brother is son of the same parents as another person.
As an adjective welcome
is whose arrival is a cause of joy; received with gladness; admitted willingly to the house, entertainment, or company.