I looked back and found where I had seen this "indian sister of Pocahontas" theory for Joseph, Raleigh's son. Below is info posted by M Roberts, dated 6 July 2008

"I cannot give all of supporting evidence, but the story goies that Pocahontas took a number of her relatives to England, with her, including her first cousin, daughter of Powhatan's sister, name unknown (but Leonard-reacher)called her Rachel as a possibility, since that name came down in the Crowshaw family. The Indians all took Christian names upon baptism. Pocahontas' name was Rebecca. Anyway, Pocahontas and her relatives stayed at the esate of Lord Delaware, Thomas West, in England, were Rachel supposedly bore an illegitimat son by Thomas West called Toby West or his Indian name, Totopotomoi. Rachel ended up marrying Joseph Croshaw and moved back to Virginia. Her daughter, Unity Croshaw, married Col. John West, nephew of Lord Delaware. Before marriage to Unity. John West has a known illegitimate son, John West by Cockacoeske Queen of the Pamunkeys. Cockacoeske was also married at one time to Totopotomoi,Pocahontas' son, Thomas Rolfe, moved back to Va. where he had a daughter, Jane, who was ofen cared for by Unity (Croshaw) West. The connections seem to be endless.Rachel would have been in line for the ruling position of the Pamumkeys.

When Totopotomoi took over, it would mean tht his mother had to be dead. Checked the Croshaw's family and sure enough, at the time Totopotomoe took over, Joseph Crowshaw's first wife had recently died.

Also, you will see in Cavalier's and Pioneers by Nugent that Toby West has a paptent for 500 acres of land that was later taken up by Col. Joseph Crowshaw. One of the early writings states that Totopotomoi's land was overtaken by an English Colonel.

Somehow, that 500 acres to have gotten back to Cockacoeske's son, John West, By Col. John West, as Indian John West left a will in Stafford Co. in which he left 500 acres "at Pamunkey" to his son.

Also, Col. Joseph Crosshaw's father, Raleigh Croshaw, appears to have had an Indian wife (not Joseph's mother, howver) fromhis long residence with the Patawoneck Tribe in Va. William Crowshaw, the Indian, was probably a son by the Indian marriage of Raleigh Crowshaw. This information was supplied to me by William L. Deyo"