The May 2018 issue of BBC History Magazine has a very interesting article by Sarah Gristwood about Elizabeth Woodville (Queen consort of Edward IV).
Elizabeth was Lady Jane’s great-great grandmother on both sides.
Jane’s father, Henry Grey, was a descendant of Elizabeth’s first non-royal marriage, while Jane’s mother, Frances Brandon, was a descendant of her marriage to Edward IV.
Elizabeth Woodville featured in Sarah Gristwood’s ‘Blood Sisters: The Women Behind the Wars of the Roses.’
You can read my interview with her at Blood Sisters.