Short answers, pulled from the story.
Elizabeth Tilney, Countess of Surrey (born before 1445, died the 4th of April 1497) was an English heiress who became the first wife of Thomas Howard, 2nd Duke of Norfolk, then still Earl of Surrey. She served as a lady-in-waiting to Queen consort Elizabeth Woodville and was the maternal grandmother of Queen Anne Boleyn and the paternal grandmother of Queen Catherine Howard.
Elizabeth Tilney was the maternal grandmother of Anne Boleyn through her daughter Elizabeth Howard, and the paternal grandmother of Catherine Howard through her son Lord Edmund Howard. Both women became queen consorts of Henry VIII, making Elizabeth Tilney a grandmother to two of his six wives.
Elizabeth Tilney's burial place is unknown. The traditional claim that she was buried in the nun's choir of the Convent of the Minoresses outside Aldgate has been challenged by historian Marilyn Roberts, who argues the will attributed to her was written nine years after her death and refers to her as Duchess of Norfolk, a title she never held. The most likely candidate is Thetford Priory in Norfolk, the Howard family mausoleum.
Elizabeth Tilney is commemorated as the Countess of Surrey in John Skelton's poem The Garlande of Laurell, composed in 1495 during Skelton's visit to the Howard residence of Sheriff Hutton Castle. The poem records a ceremony in which Elizabeth, three of her daughters (Anne, Elizabeth, and Muriel), and the gentlewomen of her household placed a garland of laurel worked in silks, gold, and pearls on Skelton's head as a sign of homage.
Elizabeth Tilney's first husband was Sir Humphrey Bourchier, son of John Bourchier, 1st Baron Berners, whom she married around 1466; he was killed at the Battle of Barnet on the 14th of April 1471. Her second husband, whom she married on the 30th of April 1472, was Thomas Howard, future Earl of Surrey and later 2nd Duke of Norfolk, with whom she had eleven children.
Elizabeth Tilney's eldest son, Thomas Howard, became the 3rd Duke of Norfolk and led the Howard family to become the premier family of England during Henry VIII's reign. Her granddaughters Anne Boleyn and Catherine Howard both became queens consort, and her great-granddaughter through Anne Boleyn was Queen Elizabeth I.