Did Mary have any bothers or sisters?

Answer 1

Do you mean Mary Tudor, eldest daughter of Henry VIII? If so, here are some notes regarding her sister and brothers:

Mary I (1516 - 1558) eldest daughter of Henry VIII (1491 - 1547) and his first wife, Catherine of Aragon (1485 - 1536), had the following siblings:

Elizabeth I (1533 - 1603) by Anne Boleyn (c1501-07 - 1536) - second wife

Edward VI (1537 - 1553) by Jane Seymour - third wife (c1504-09 - 1537)

Catherine of Aragon did give birth to six children, but apart from Mary, they were stillborn or died within a few weeks. Anne Boleyn had at least two miscarriages.

Anne of Cleves (1515 - 1557)

Catherine Howard (c1520 - 1542)

Katherine Parr (c1512 - 1548)

did not bear Henry any children.

Henry also had an acknowledged illegitimate son:

Henry Fitzroy (1519 - 1536) Duke of Richmond (by Henry's mistress Elizabeth Blount)

There may have been other illegitimate children, possibly by Mary Boleyn, (and in particular her son, Henry Carey) another of Henry's mistresses and sister of Anne Boleyn; but they have not been confirmed or acknowledged, probably because of the timing of the relationship between Henry and Mary Boleyn.