family reunification

Hi All,
Need some advice and help. appreciate ppl's time but pls advise if you really know it!
my parents, my bro and sis have been recently been granted refugee status in ireland. i am in uk since 2001 on student visa whihc is running out at end sep this yr. i completed my msc and currently doing cima studies. can i join them as dependent as i cannot go back but i am not under 18 but every yr, my father sends me money for my studies, i have receipt of last yr. is that enough to prove my financial dependency? what other docs are required?
thanks
SIA