brothers    abavūkana (from kuvūkana)
En-En dictionary 
brother    (my) mwēne data
(your) mwēne so
(his, her, their) mwēne se
(older ~ of boy) mukuru, mukurwanje
(younger ~ of boy) mutoyi, murumuna
(of girl) musāza
(of my mother) mārume
(of your mother) nyokorume
(of his, her, their mother) inarume
(of father, uncle) dāta wacu, dāta wanyu, dāta wabo
(to be ~ and sister, or to be ~s) kuvūkana
(religious, monk) umufrere
En-En dictionary 
gukuririrwa (-kuririwe)     v    to be followed, to have younger brothers or sisters
mwēne data (b-)     phr    1  class 1
singular: umu-
plural: aba-
  
my sibling (a brother or a sister)
bene data my siblings (my brothers and sisters)
kuvūkana (-vūkanye)   v    to be brothers and sisters
abavūkana    1    brothers (from kuvūkana)
 brothers found in: Kirundi I (Study lessons)
lesson 74   Brother and Sister
lesson 81   Review 71 - 80