My parents are divorced and are now emigrating. They need my birth notarization, relative notarization, parents' marriage notarization, statement ... please help explain.

Did you get divorced when you applied for immigration? Do the application materials reflect the divorce?

If you want to prove that your birth and your relationship with your parents are normal, notarization will do.

If you didn't get divorced when you applied, the embassy will notarize your birth certificate now;

Then, provide a notarization of the parents' divorce certificate and a copy of the previous marriage certificate or make a notarization, plus a copy of the divorce agreement or judgment, preferably notarization.