1. Arthur, Prince of Wales (November 19, 1486 – April 2, 1502): Arthur was Henry's older brother. He was born to King Henry VII and Queen Elizabeth of York. He was the heir apparent to the English throne, but unfortunately died at the age of 15 due to illness.
2. Margaret Tudor (November 28, 1489 – October 18, 1541): Margaret was Henry's older sister. She married King James IV of Scotland in 1503 and became Queen of Scotland. Margaret played an important role in maintaining peace between England and Scotland during her lifetime.
3. Mary Tudor (March 18, 1496 – June 25, 1533): Mary was Henry's younger sister. She was first married to King Louis XII of France in 1514, and then to Charles Brandon, Duke of Suffolk, in 1515. Mary was known for her beauty, intelligence, and patronage of the arts.
4. Elizabeth Tudor (July 2, 1492 – September 14, 1503): Elizabeth was Henry's younger sister. Unfortunately, she died at the age of 11 and did not play a significant role in English history.
5. Catherine Tudor (February 2, 1503 – February 10, 1503): Catherine was Henry's youngest sister. She was born prematurely and died as an infant, only living for a few days.
It's important to note that Henry VIII also had several half-siblings from his father's previous marriages. These included Margaret Pole, Countess of Salisbury; Henry Fitzroy, Duke of Richmond and Somerset; and Mary FitzRoy, Duchess of Richmond. However, these half-siblings had different mothers from Henry VIII and were not as closely related to him as his biological siblings were.