Tip - Parents and Step-Parents: Where Is the Boundary Line?

As both a mother whose children have a step-mom and as a step-mom myself, I honestly have no idea where this supposed line is. It changes completely depending on the parent and I am pretty sure I have unknowingly crossed that line as both a mother and a step-mother.
Tags: parents, and, step-parents:, where, is, the, boundary, line?, divorce