It would be a good assumption that a widow with children would live near or with her family, but we have no proof of this. I have found a "Mary Luzader" on the 1840 census for Fountain County. Since the names Mary and Polly were somewhat interchangable at that time, like Peggy and Margret, this could be her. She is listed as head of household, with male children in the age groups of, (1 to 5) = 1, (5 to 10) = 2, (10 to 15) = 1: female children in the age groups of (5 to 10) = 2, (15 to 20) = 1, and she must be the female listed as (20 to 30). I doubt that all of these children are hers. If this is Polly, it would show that the younger and orpaned children of Andrew and Rebecca are still with her, and that Thomas' full blood sibling has most likley died. Family legend says that Rebecca and Andrew came from Virginia and died leaving many small children that were "farmed" out. I know that my ancestor (the younger Andrew), was legaly bound out to a farmer named Miller, in Vermillion County, Indiana. I am sorry to say that I don't have the 1850 census for Fountain County, and this would be a great resource for sorting out the question you have asked; " what happened to Polly ". And a complete search of death records is very much needed. There is a record of a Mary Lusadder marrying a Samuel Prevo in Fountain County in 1847. Agian, they need to be found on the 1850 census, and if Thomas is there as eleven or 12 years old, that would be good evidence to me that Mary and Polly are the same person.