50 Cent hasn't been fulfilling his parental duties, according to Shaniqua Tompkins, the mother of his eldest son.

Tompkins claims 50 hasn't seen 17-year-old Marquise Jackson in two years. Their last face-to-face was in May 2012, long before the rap mogul's second child, Sire Jackson, was born. 

Father and son also haven't talked since last January, when the two got into a heated exchange over text message. Prior to 50 telling the teen things like, "I don't have a son anymore," and "F--k you, stop texting me," the G-Unit leader went to visit Marquise at his home in Atlanta, but the youngster allegedly refused to open the door.

Tompkins says her son is feeling neglected by his father, who has been doting on his younger son a lot recently. 50 posted and later deleted several pictures of the toddler on Instagram, and has yet to introduce Marquise to his brother. The teen reportedly didn't even know about his new sibling until he read a story online. 

50 and Tompkins have long had a volatile relationship and have publicly battled over money and visitation rights over the years. In 2008, the Queens-born MC was rumored to be involved in a suspicious fire at the $2.4 million Long Island, N.Y. home Tompkins lived in and sued him over. His son and others were injured in the blaze.

Meanwhile, Tompkins reportedly hasn't worked since 2002. Her latest allegations were written off as nothing more than a smear campaign motivated by money, a rep for the rapper said in a statement. "50 is saddened by the attention-seeking tactics of his son's mother," the rep told TMZ. "He remains a proud and supportive father and feels blessed to have two sons." 

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(Photo: Dave Kotinsky/Getty Images)