If your father is Abraham, then do the works Abraham did
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In keeping with the connection between a person's works and their father, Jesus challenges them. If Abraham is your father, then do the works he did. What works did Abraham do?
He believed God would give him an heir even in his old age.
He left his land and his relatives to go where God told him to go.
He obeyed God and offered his only son Isaac to God. Hebrews tells us that he believed that God could raise Isaac from the dead.
He defended Lot and the people of Sodom when they were abducted by the 5 kings
He was circumcised and circumcised his household because God told Him to do so.