Need my dad birth date for my passport infro, however, he is decease as well as my mother

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His birth date may be on his death certificate.

Also, you can look him up on the Social Security Death Index if he had a social security number:
FamilySearch.org - Search (http://www.familysearch.org/Eng/Search/frameset_search.asp?PAGE=ssdi/search_ssdi.asp&clear_form=true)