Joan d'Arc, La Pucelle d'Orleans - primary source?

- Anne Brannen - - Having given my relation to Jeanne d'Arc, La Pucelle d'Orléans as my 8th cousin 16 times removed (& listing all my connections down from my father to her - has brought me sharp criticism - to which I have no answer other than the notes on her profile, her mother's profile, & on her maternal grandfather's profile - & the criticism continues - as with the questions below:

~ ~ Where is a contemporary, primary source which names the maternal grandparents of Joan of Arc? ~ ~ Also, the Dukes of Milan (before the Sforza) were named Visconti. Can your source(s) explain how either Milanese Dukes or Bavarian princesses came to have a roofer as a son/grandson?

Please help me with a response to these questions.