I am also looking for information on John Brock and Martha Hawkins Harrison. All my life, I heard my grandmother talk about Martha being related to Rebecca Hawkins (Davy Crockett's mother), but I can't confirm it. I am stuck on these two relatives and can find nothing about their parents. I am a descendent of William Ferdinand Harrison, one of their sons. If anyone has any information to share, I certainly would appreciate it. Also, if I find anything, I will pass it along here. Thanks!