求救：申請130，幫兄弟移民，已遞交3年多。突然要我和兄的出生證

當初申請時，已遞交中國公正的本人出生證和兄的公正的出生證。目前移民局來信：
No date of birth registration--petitioner,
No date of birth registration--bebeficiary
they said it doesn't clearly indicate the date of registration.
這是中國的出生公證：
This is to certify that XXX, male, was born on Dec,5th,1978 in Beijing, the father of XXXX is AAAAA, the mother of XXXXX is BBBB.

移民局還要旁證，請問還有什麽能證明兄弟關係的？ 有經驗的大俠幫忙，多謝了！