Another fan, AiryGr8, agreed with the original theory and responded; “I think I remember Dom complaining to Reddington about how he stole his daughter and granddaughter from him.”
The user added: “Though given all the other plot holes in this show, this doesn’t sound very far fetched.”
Throughout the final episode of season eight, Red was supposed to give Liz a letter from her mother which promised to explain everything about his identity.
With The Blacklist finally returning this month, perhaps season nine will bring more answers for viewers and reveal the full context of the letter.
The Blacklist season 9 premieres on Thursday, October 21 on NBC. A UK release date is yet to be announced.

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