answered question
Family, it can also be used when greeting friends. This is the case depending on how close a person is to certain people.  If they are just like family then that may be what they are called.
A composition written of lyrical and rhythmical lines which forms into a stanza. There are many different types of poems. A poem is usual writen out of emotion, ideas, and experiences. May be you should read the poem " Raven" by Edgar Allen Poe.