Also in the final episode, it shows Leo and Piper growing old and becoming grandparents. One of hte grandchildren is sitting with Piper in the last scene when all the kids come in, the grandchild sitting in the chair with Piper uses kenisis to close the front door. Melinda would only be a witch because by then Leo wasn't a Whitelighter anymore and was just mortal. Wyatt and Chris are witch/whitelighter.