You've answered your own question, son.
You must wait until you become an adult at age 18 to receive a passport.
Even at age 18, you'll need to provide the appropriate legal documentation to obtain same.
A death certificate isn't impossible to obtain.
But, you must follow the law.
Fact of life, son, no one must accede to any request, or even respond to your entreaty to cooperate.
Therefore, you do as many have done, wait until you become an adult.
As an adult, you do for yourself, or you do without.
The law in SK says:
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In most cases, an extract from or copy of the registration of death will suffice as the legal document needed to meet the requirements of most legal needs. Application to receive the Death Certificate of a person is restricted to the following eligible persons:
• Their spouse, if legally married or common-law at the time of death
• A parent who appears on the original registration of birth as mother, father or other parent
• An adult child of the deceased (18 years of age and older)
• A person authorized by an eligible person (above) in writing. View the written Authorization
guidelines
• The legal custodian or personal/property guardian of the person. A copy of the Court Order, Custody
Agreement or other legal documents must be provided with their application
• The personal representative of the estate of an eligible person. A copy of the subject individual's Will
or Letters' Probate or Letters' of Administration or Court Order appointing the Applicant as the
personal representative must be included with the Application as a supporting document
• A person that needs to prove Métis or Treaty status. The request must either include a letter from the
Métis Nation-Saskatchewan (MN-S)or Aboriginal Affairs and Northern Development Canada(AANDC) supporting the request or else the application must be from MN-S/AANDC with a consent letter from the person seeking to prove parentage
• In response to a Saskatchewan court order or subpoena. A copy of the court document must accompany the application
• A person that needs it to prove a joint tenant has died for land titles purposes. The land title stating "joint tenant" or a quick search results having both names on it will serve as a supporting document
• The Public Guardian and Trustee of Saskatchewan, Canada or any other country. The request requires a letter stating the reason for the request with enough information about the person to identify them. This should be on agency letterhead and signed by a person with the authority to make the request
Read this:
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Order a Death Certificate
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http://www.ehealthsask.ca/vitalstats/Documents/Who Can Apply for a Death Certificate.pdf
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Order a Death Certificate
Good luck.