Andón and Fonta are the true parents of all mankind.  They lived at the beginning of the third ice age, in a difficult and invigorating environment.  Both were born in what is now India. 
His father was killed by hostile gibbon monkeys.  They were a great test for their Primates parents.  They were never popular with their Primates cousins.  The parents were among the most intelligent group of Primates, the first to learn to throw stones and use clubs. 
They almost lost their lives on numerous occasions because of their great curiosity.  Urantia's memorable day occurred when both twins met one day at noon, and made the decision to flee their clan.  Received definitive names from the archangel who announced the inhabited state for Urantia.  The names they gave themselves were Sonta-an, loved by the mother, and Sonta-en, loved by the father. 
Andón and Fonta had a total of 19 children.  The Eskimos are the only survivors of the race that formed Andon and Fonta, the Andonites. 
Andon was the discoverer of fire.  Andón taught how to solve controversies by beating a tree; the first to break the stick was the winner.  Andón's philosophy was very confused; both were almost fire worshipers.  Developed an improved language of signs and words.  Both possessed a personality.  Were inhabited by Adjusters. 
Both died at the age of 42 from a rockslide during an earthquake.  Although the loss of Andon and Fonta would not have prevented human evolution, it would have retarded it.  Both succeeded in merging with their Adjusters on Jerusem.  Both achieved eternal survival and still reside on Jerusem.  They have never returned to Urantia, although they have tried to send greetings to all Urantians at the time of writing The Urantia Book.  Now they are in charge of welcoming pilgrims from Urantia on the first mansion world. 
See also: UB 63; UB 62.5; UB 136:4.5.