In trying to give a different estimate of the dates of an unknown father of my father (see Berg-1880) , I posted dates that seemed logical and reasonable. My father's dates (Rudolf Berg, b. 1907 d. 1984) are known and accurate. His father is unknown, so I've estimated his based on my paternal gm's known dates (Anna Berg 1889-1980), but yes, it's a guess--he could be a lot older or about her age, 16 yrs. The message I get is: "Warning: Check the dates.A child's birth date should not be before a parent is six years old." Sure, Obviously. But--Is this a question for The Tech Studio?