Jonathan Sidney MacCarthy II (b. January 20, 1920) is the father of Chawosaurian Prime Minister Jonathan Sidney MacCarthy III, and the only son of Jonathan Sidney MacCarthy and Charlotte MacMillan (sometimes spelled Macmillan).

MacCarthy was born in a dysfunctional household, an abusive father who one time spread rumors about MacCarthy being gay in his high school that they had to move to Gold Coast from Sydney, but his mother was the opposite way, Charlotte MacMillan encouraged her son to get engaged in politics, public service, and community work, and she raised MacCarthy into the values of the Australian Labor Party.

In 1946, he married his first cousin once removed, Elizabeth Victoria Boleslaw, and had eight children with her, most prominently Jonathan Sidney MacCarthy III.

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