The Kushner and the Netanyahu families are close. Netanyahu has even stayed with the Kushner home when he's been in NY. The Kushner family funds Jewish settlements in the Occupied Territories.  There no way the Palestinians will consider him an honest broker.

Kushner is a part of the Netanyahu team which plans to screw the Palestinians. The objective is a collection of small disconnected Palestinian ghettos in the West Bank that are completely dependant on Israel (which they will call the State of Palestine), the transfer of many Israeli Arabs to the ghettos and the absorption of Gaza into Egypt. 

This plan cannot be allowed to move even one small step forward.