I found a marriage record for John Cave and Elizabeth Aleshite, daughter of Henry Aleshite, recorded in Shenandoah County, VA, dated November 2, 1811. I believe the groom to be the son of the Thomas Cave whose will was probated in Fauquier County, VA, in 1797. Unfortunately, I am not certain because there appears to be two different John Caves in the area about the same time. However, the other one seems to be the father of brides who could not possibly be the children of the John Cave who married Elizabeth Aleshite. If it is the man I think, two of his siblings married in Shenandoah County about the same time. Rhody Cave married Archibald Watkins on January 11, 1811, and John Cave was the bondsman. Samuel Cave married Phebe Vaught on June 21, 1816.
Elsewhere on this board, I read a post mentioning a John and Elizabeth Cave in the Page County, VA, census of 1850. I have not had a chance to check it out yet, but if the census roll indicates that he was born in MD, or possibly VA, about 1786, then I will be fairly sure he is my relative, If you have additional information about any of the individuals mentioned previously, please contact me.