Simplify the following text for a Grade 4 native English-speaking person.
Original: The race was red flagged to facilitate cleanup of the track , and when the race resumed , it was Earnhardt and DEI drivers Earnhardt Jr. and Michael Waltrip who were running up front . As the laps wound down , Waltrip was leading Earnhardt Jr. and Earnhardt .
Simplified: He is the father of race car driver Dale Earnhardt , Jr. .