How many great grand children does Harry Truman have?

acording to research Jeremy Truman is harry as trumans grandson and Jeremy has 3 kinds since research in 2007 theyre names are alexis Marie king , Kayla nichole Truman , and Erin lee Truman also he is going to get married and his fiances name is tanya lee king. since 2007 this has been the research we have done.