John Amos ' daughter Shannon is claiming her brother, K.C. , colluded with 2 others to take advantage of the declining actor .
.. alleging his will was changed before his death.
Shannon appeared on "TMZ Live" Thursday, where she was joined by John's former business manager, Paul Baldassarre , her daughter Quiera Colston, and John's God-daughter Amy Goudy ...
to sound the alarm over their unanswered questions about the shocking circumstances surrounding the "Good Times" star's death. According to Shannon, John was diagnosed with Lewy body dementia in 2016, prompting K.C.
to move in with their dad -- and she says K.C. then proceeded to isolate the TV legend from his other loved ones .
.. even monitoring his phone calls.
Shannon says K.C.'s alleged drug addiction and mental issues led to estrangement among the family -- and alleges her brother withheld treatment from their dad.
Baldassarre, John's ex-business manager, also claims he and 2 other individuals were the actor's powers of attorney ...
before K.C. allegedly took their place without any discussion.
Shannon said ...
"My uncle was actually the head of his estate and he had to do 5 wills because my brother would come in ...
and would get him to sign paperwork. He would undo everything." As TMZ previously reported .
.. K.
C. announced John's death through a statement on Tuesday, claiming the Amos patriarch passed away from natural causes in Los Angeles in August. Shannon said Tuesday she learned of her dad's passing " through t.