I feel your anger, brother. It seems to be a common reaction among family members today, no matter how overwhelming the evidence, to dispute their loved one's involvement.
Consider a case that involved me, a while back, at the prison where I work. We have an inmate doing an eight-year stretch for drug dealing. His wife came to visit him, along with her three kids of 7, 5 and 3 years old (only the youngest being the child of the man she was visiting). She smuggled in drugs, hiding them in her kids' underwear and her own. Our security cameras filmed her extracting the drugs (surreptitiously, so she thought) and handing them over to her man. We promptly sent in a security team, isolated the group, and placed her under arrest.
She went into a screaming fit, accusing us of racism, sexism, and any other -ism she could think of, denying all knowledge of any drugs, etc. We confronted her with the video evidence, and she accused us of faking it digitally (!). Her kids, of course, were having fits seeing their mother so upset, and got even more so when we had to handcuff her to stop her assaulting our officers. She also called me all sorts of names (I was present in the visiting room) for not siding with her against these "oppressive cops".
We had to call the FBI to arrest her (drugs in a federal prison make it a federal case), and called Child Protective Services to take away her kids. It was heartwrenching to see her kids taken away, screaming for their mom, crying, etc... all because this stupid bitch used them to smuggle drugs.
What's the betting those kids will grow up hating authority, distrusting cops, etc., all because of their mom's example?