Warning: Contains SPOILERS for The Boys season 3.
It is not entirely clear what connection Mother's Milk and Soldier Boy share in The Boysseason 3, but already it is evident that Homelander's influence on the vigilante's daughter makes this history harder for him to bear. In The Boys, every member of the titular gang has a reason for their hatred of superheroes. Butcher wants revenge against Homelander for his monstrous mistreatment of Butcher's wife, Hughie wants revenge for A-Train killing his girlfriend, and even Frenchie resents his failure to stop Lamplighter.
However, Mother's Milk is one of the most adamant about his hatred of supes, and his reasoning for this has never been explicitly stated. Now that The Boys season 3 introduced Soldier Boy, however, flashbacks are starting to make the origins of Mother's Milk's anger clearer. Unfortunately for the antihero, this origin story has only made his current predicament sadder.
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From whatThe Boys season 3 has shown so far, Soldier Boy was a jingoistic, nationalist, right-wing political figure who directly hurt the family of Mother's Milk and indirectly led to his father's death (judging by episode 4's mysterious flashbacks). Now, Homelander embodies these same characteristics and is someone who both Mother's Milk's daughter and her stepfather idolize, meaning M.M. has to watch his daughter fall for the sort of monster who ruined his life (while Butcher secretly brokers a deal with Soldier Boy himself for his own ends). With Soldier Boy's origins still not being clear, it is hard to say for certain what role he played in Mother's Milk's past, but it looks as if their ill-fated interaction directly led to M.M.'s
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