Why wasn't Lady Beaufort

He was handed over to Lord Herbert, a Yorkist because he was one of the few Lancastrians with any claim to the throne. He wasn't entrusted to Jasper's care until the readeption, and when HVI was finally done away with and his heir dead Jaspar legged it with Henry because he was the last Lancastrian claimant standing.



I'm the clever one; you're the potato one.

Margaret Beaufort was maybe 13 or 14 when she was widowed after Edmund Tudor died. She was one of the greatest heiresses of her time and would have been expected to marry again and live with a new husband and (likely) start a new family. Her son was born into an earldom. He would have been expected to one day take up those lands. His uncle Jasper was considered the ideal choice to become his guardian since he had an Earldom very close to Henry Tudor and was Henry Tudor's paternal uncle. And thus Henry could grow up close to the lands he would one day administer. Its not surprising that Henry was given to Lord Herbert to raise after the Yorkists took over. Edward IV didn't have a lot of grounds to confiscate his property, but would want to keep an eye on him since he came from a prominent Lancastrian family.