ojisama = prince
itsumo = forever
niichan/oniichan = brother :?...methinks
the 'chan' is an honourific, and the 'o' is used for respect, you could say nii-san which is higher respect than chan, or you could use the highest respect and say nii-sama.
nii = brother
nee = sister
or,
aniki = brother
aneki = sister
to = father, but cos no one speaks like that people would say 'oto-san'
ka = mother, same like the above one so people say 'oka-san'
^ the above two are more like 'dad' and 'mom' whereas the traditional way is,
chichi-ue = father
haha-ue = mother
now the honourifics,
sama: used for extreme respect
dono: used for respect
sensei: used for teachers/masters etc
sempai: used for someone with more experience than you
ototo: younger brother
imoto: younger sister
jii: grandfather or elderly man
baa: grandmother or elderly woman
oji: uncle
oba: aunty
bo: used for babies
'san' is the usual honourific which is used after those things, like oji-san, oba-san, baa-san, jii-san etc