In the current WoW expansion, Warlords of Draenor, former Horde Warchief Thrall finds himself fighting alongside allies Durotan & Draka, the leaders of the Frostwolf Clan. As Thrall well knows, these two are
his parents, neither of which he had a chance to know in the prime timeline.
I have gotten at least one Horde character to 100, but so far I haven't seen any questlines where this relationship is revealed to the characters in question.
At any point in the expansion, does Thrall explain to Durotan & Draka who he is?