Am a guy of 24years of old, planning on a business i can do, that no man has ever done it before, or a business i can do that we have few people doing that same thing, for my own succession

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.