Relationship Through Henry VIII:
Father: King Henry VIII
Mother of Mary I (Mary Tudor): Catherine of Aragon
Mother of Queen Elizabeth I (Elizabeth Tudor): Anne Boleyn
Explanation:
Henry VIII fathered both Mary I (with Catherine of Aragon) and Elizabeth I (with Anne Boleyn). Hence, Mary I and Elizabeth I were half-siblings sharing the same father but had different mothers. Mary inherited the throne after the short reign of Edward VI, Henry VIII's son from another marriage. Due to her efforts to restore Catholicism during her five-year reign and persecute those who opposed, such as Protestants, the moniker "Bloody Mary" grew associated with her reputation.