Heirship Issues/Clear Title

[Gregory Wesley]

I have a deal under contract and we are having some trouble getting clear title. Title has been working on this for a few months. They have completed a few affidavit of heirships but have a few more that need to be done but the heirs don't know a lot of the info ie marriage date/place, date/place of death. Do you guys know what can be done in this scenario?