Pieter the Elder had two sons: Pieter Brueghel the Younger and Jan Brueghel the Elder (both kept their name as Brueghel).
Other members of the family include Pieter Coecke van Aelst and Mayken Verhulst (father-in-law and mother-in-law to Pieter Bruegel the Elder), Jan van Kessel the Elder (grandson of Jan Bruegel the Elder) and Jan van Kessel the Younger.