So, Tudor history starts with the birth of Henry VII, and the the cutthroat political game that his pious but vicious mother, Lady Margaret Beaufort, executed to put him on the throne. She claimed that she had a vision from God that her son (King Henry VII) would rule, despite an issue of being a line (John of Gaunt) based on a legitimized bastard heir; the condition for legitimization was that the descendants could to never claim the English throne.
You have to follow Margaret, and at least go back to Edward IV of England’s reign (he dethroned and defeated the mentally-ill King Henry VI - who was not a Tudor king nor related), or you’ll miss half of the family drama that inspired many works, such as “A Song of Fire and Ice”, best known as “Game of Thrones”, “The Lord of the Rings”, and lesser writings like Philippa Gregory’s excessively embellished historical fiction novels. The Tudor line ends with Queen Elizabeth I. Also, Edward IV’s brother was King Richard III, infamous for his treachery, including deceased Edward’s legitimate heirs/ Richard’s nephews, the famous “Princes in the Tower [of London]”, who conveniently just disappeared forever while under Richard’s charge.
From the 100 Years War to the War of the Roses, the medieval Tudor Dynasty, and their extended family were a real life historical soap opera.