Jermaine Jackson made  a short not planned appearance on the third episode "Full of Surprises" (aired on Lifetime on October 16th, 2015) of season one of his nephew's 3T's reality docu series "The Jacksons; Next Generation" as Taj, Taryll and TJ (Tito's sons) confront a woman named Tanay Jackson who, for years, has claimed to be their sister. They are doing a DNA test and the results showed that Tanay is not a biological sister of Taj, Taryll and TJ or a child of Tito Jackson.  

Jermaine Jackson on "The Jacksons: Next Generation" from JJ on Vimeo.