It's appropriate to check ''unable to provide information'' if your parents are deceased and you don't have that info and/or you were raised by someone other than your parents. Please be sensitive here.
Let's look at the instruction manual pages 37-38 (to find the instruction manual I googled
aamc amcas instructions )
Enter information regarding your parent(s)/
guardian(s). Click the Yes button to add a
parent or guardian.
Enter the first and last name of a parent/guardian in the designated box.
Indicate whether this parent/guardian is living.
Select this person’s occupation from the designated drop-down list.
Select the highest level of education completed (e.g., High School Graduate,
Bachelor’s Degree, Master’s Degree, etc.) from the designated drop-down list.
Indicate the country in which the highest level of education was completed.
The subsequent highest education level school information items are dependent on
what you have selected from the Highest Education Level drop-down list.
If you have selected “High School or less” as the highest education level and this school
is located in the United States:
Select the state, county, and school from the designated drop-down lists. Enter
the city in which this school is located.
If the state appears but the county does not, select <state name> Unknown
County” from the county drop-down list.
If the state and county appear, but the school name does not, select “US Not
Coded” from the school drop-down list.
If you have selected “High School Graduate” or less as the highest education level and
this school is located in Canada:
Select the province in which this school is located from the designated dropdown
list, then select the school and enter the city in which it is located.
Indicate the country of Legal Residence of the person you are referring to.
If you have selected “Some College or higher” as the highest education level and this
school is located in the United States or Canada:
Select the state/province and school from the designated drop-down lists. Enter
the city in which this school is located.
For all selections if the school is located in a country other than the United States or
Canada:
Select the country and school from the designated drop-down lists, and then
enter the city in which it is located.
Indicate the country of Legal Residence of the person you are referring to.
To enter another parent or guardian, click Add Another Parent/Guardian. Once you
have entered all parent(s)/guardian(s), click Done at the bottom of the page.
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If you are parents are deceased, you can check "N" to the question "Living?" You can enter the information on guardians as well as parents.