Rob Kardashian and Blac Chyna weren't faking it when they exchanged Twitter pleasantries -- the two are actively communicating and repairing their relationship ... for Dream's sake. . Sources close to the former couple say they underwent at least 7 mediation sessions together to iron out a deal for custody of Dream, and they've continued to be in direct contact about their daughter's care. Translation: for the first time in a LONG time Rob and Chyna are cordial. . We're told the goal is for Rob and Chyna to make face-to-face handoffs of Dream. Of course, they'll still have nannies standing by to assist sometimes. . As for the physical custody of Dream -- Rob will have her for the majority, but they'll be splitting holidays equally and finding ways to accommodate both parents.