Thank you for your response. You are correct. The Martha Fitts who married Sam Latham is not the same Martha who was living in the Martha Rea household in 1850 along with Julia Fitts and a unnamed Fitts child. The Martha who married Latham was in her father's household in 1850, listed as Rebecca and was living with her mother in 1860 along with her two younger sisters.I have also determined the Martha I am seeking was not the the daughter of Henry Fitts who later married Oliver Brazell.
I am speculating that Julia Fitts may have been related to Martha and married a Fitts who died about 1847 but I have no support. I would appreciate any information or thoughts.