Hi, I am sponsoring my mother who has long been separated in fact from our father. We do not know his whereabouts . Guide 5772 says that IMM 5669 shall be filled out by the spouse of the principal applicant , accompanying or not. How will we submit our father's IMM5669 when we do not know where he is? Please help as the application may be treated as incomplete if we commit error. Thanks a lot guys for any help.