you can contact vital records for the state you were born in and ask about birth/death records for your sibling
what state were you born in?
Please be aware that 'FamilySearch' ...
▬ is used by Users/Patrons from MANY, "Counties"; and, "Unions", from ALL around the World.
▬ has "Records" from MANY, "Counties"; and, "Unions", from ALL around the World
IF, you provide the "Location" (ie. Locality, Shire/County/State/Province; Country/Union) of "Birth"; THEN, the members of the "Community.FamilySearch" Forum MAY be able to, help/assist you; and, point you in the right direction.