Highlight illogical and contradictory data.

Problem: Wrong birth date.

Genelines helps by placing child “birth event” symbols on a parent’s life bar showing when the child was born to that person. In the following example, Avernia Hatchard is shown to have had a son (i.e. solid square symbol to extreme left of Avernia’s life bar) before she herself was born. It is obvious that the birth date of either the mother or the son is incorrect. A check of the data shows the researcher had recorded the child born in 1839 instead of 1893.