1850 Wayne Co Illinois Census

1850 Census of Wayne County, IL shows an 18 year old Polly Gates living with J.P., Elizabeth, Sarah, Susanah, and Valentine Gates. This Polly is approximately the right age and born in Tennessee. It doesn't tell her relationship to the Head of the Household, but maybe, as the youngest, she was sent to live with relatives when whatever happened to the parents, happened.  Could this Valentine be the brother that Christina mentioned in her recollections?