Lucy Boyd is buried [with her son Hugh A. Allen, Hugh's second wife Mary McDermott and their son Hugh Andrew] in Franklin St. John's Catholic Cemetery in Wakarusa Township, Douglas County, Kansas. The dates on her stone are May 24, 1806 & January 30, 1895, her name on it is Lucy Walker, Grandma. Lucy was married to John Walker June 19, 1856 in Patrick County, Virginia.
I have heard Preston Allen called Preston Jackson and also Patrick Preston, I don't know if either is correct but he is called Preston Allen in the marriage bond for him and Lucy Boyd dau of Hugh Boyd dated January 3, 1827 in Franklin County.
Of the children, Malinda J. married George Martin, Martha Ann married William Barber Martin & Creed married Elizabeth Martin. I don't know how these Martins are related but it seems very likely that they are.
I have come to the conclusion that Preston didn't die before 1850 [that is the information available online] there is a Preston Allen in Kanawha County, West Virginia during the 1860 census with a wife, Winney and three children. In that county on September 19, 1865 Preston Allen, 60, [this matches the age for Lucy Boyd's husband] widower, born in Franklin County, Virginia, son of William & Rachel Allen, occupation farmer, married Winney Pauley, 44, single, born in Kanawha, daughter of Ephraim & Anne Pauley. Officiating minister, A. Stevens.
A daughter of Franklin County's William Allen, Theodocia, married William Eskew and they moved to Kanawha County before 1850, also, she named a son Preston. The Eskews and Preston Allen lived close to one another in Kanawha County. Taken all together it looks to me like Preston went to Kanawha County with his sister's family before 1850 and took up with this Winney Pauley having children born starting in 1851, when they finally married in 1865 he called himsef a widower, but he was probably still married to his first wife. It is possible that he was married to another woman named Winney before he married Winney Pauley. Please remember, this is just speculation & could be completely wrong.