"Behold, your father is sick"
Rabbi Chizkiyah begins by saying that "Behold, your father is sick"refers to events at the end of exile, and means, literally, Joseph's father, Yisrael, is "worried and in haste." Rabbi Aba then adds that the name Yud-Hei-Vav יהו would be changed to Yud Hei Vav Hei יהוה to expedite Yisrael doing good for its children, so they would come out of exile. Rabbi Aba then explains Jacob's exposure to truth, and Abraham's to grace.
The Hebrew letters Yud Hei Vav Hei יהוה are known as the Tetragrammaton, one of the Holy Names of The Creator. The addition of the final Hei ה in the Holy Name corresponds to our physical realm. The other three letters יהו represent the Upper Worlds, specifically four dimensions of Keter, Chochmah, Binah, and Zeir Anpin. Thus, this passage is our connection to the Upper Worlds, via the Tetragrammaton, so that we may brighten our lives and the world with the resplendent Light of The Creator.