Darth Plageus had the power to influence the midichlorians to create life. Now, Palpatine had this power as well, but he didn’t teach him about it until after Anakin was born. Darth Plageus was allegedly still alive in The Phantom Menace.
SO, SINCE PALPATINE IS SORTA LIKE ANAKINS FATHER (HE MANIPULATED THE MIDICHLORIANS TO CREATE HIM), THAT MEANS HE IS REYS UNCLE. AND SINCE KYLO REN IS ANAKINS GRANDSON, REY IS KYLOS 2ND AUNT OR SOMETHING