Yes, what you suggest is possible and even likely.
Another stumbling block I found was when a second wife listed her husband's daughters as 'her' daughters. A quick analysis of the 'daughter's' approximate ages and date of second marriage of this woman, made it impossible for her to have been the mother. This woman had no children from her first marriage so she truly considered her step-daughters as her daughters.
'Brother' is another stumbling block as it might mean, brother, brother-in-law or even brother in the church. The same thing goes for 'sister.'