Exclusive | Filmmaker Sophia Maddox devastated and dumbstruck to learn her grandfather was Charles Manson

Her DNA search results went helter-skelter. Filmmaker Sophia Maddox broke down in tears when she and her father, Daniel Arguelles, learned from an online ancestry search that his dad was one of America’s most notorious criminals — Charles Manson.“I was obviously very devastated,” Maddox, 26, exclusively told The Post.She recalled feeling “dumbstruck” and “sobbing.”“My dad was just rubbing my back and holding me, and telling me we were nothing like him.

But, it was a little traumatic,” she added.Co-directed by Maddox and Alexandra Orton, the Hulu documentary, “My Grandfather Charles Manson” follows Maddox as she looks into Manson’s past, struggles with her fraught relationship with her father, and interviews former Manson family members such as Lynette “Squeaky” Fromme and Manson trial prosecutor Stephen Kay. Arguelles was born in 1959, when his mother, Darlene, was 17.She met Manson at a bus stop when he was going by the name “Charlie Dear” and the pair had a one-night stand.Manson — who was convicted of seven counts of first-degree murder and one count conspiracy to commit murder, including the famously horrific 1969 slaying of the pregnant Sharon Tate — died in prison at 83 in 2017.During his decades behind bars, Manson was given various diagnoses, including schizophrenia and hypomania, although experts disputed an exact condition.

 Therapists “cleared me” of mental health disorders, Maddox said. If she has kids in the future, she will “always have that concern.”However, if they do inherit issues such as bipolar or hypomania, depression, anxiety, “I do have a hopeful heart that we have tools, and we have therapists,” she told The Post. She added that if anything is passed down to her kids or future generations, she knows they’ll have “the support that they need.”Though Maddox said she has “limited” watching all of the portrayals of her infamous grandfather in pop culture, she has seen a “pre...