3:52 PM PT -- 50's attorneys, Reena Jain and Blank Rome, tell TMZ … "Despite being given ample opportunity to retract a false and malicious retaliatory accusation, Ms. Narvaez has shamefully chosen to interfere with her 11-year-old son’s relationship with his loving father by falsely calling him a 'rapist.'"
They add, "The motivation behind this appears to be Ms. Narvaez’s unfortunate entanglement and misguided loyalty to Mr. Combs, who we believe to be underwriting this attack and whom Mr. Jackson has been warning Ms. Narvaez and others about for many years."
50 Cent's through trolling his ex, now he's brought lawyers into it, and he's suing Daphne Joy for publicly accusing him of rape and physical abuse.
In docs filed Monday, and obtained by TMZ, 50 blasts Daphne for her Instagram post from March 28, where she made the allegation behind his lawsuit -- and he says she only did it because it came out that he was going to seek sole custody of their son, Sire.
50 says he only made that decision about Sire after Daphne was labeled a "sex worker" in the Rodney Jones lawsuit against Diddy -- and he claims she retaliated with the open letter to him, posted on IG.