Board Thread:Spoilers!/@comment-23906605-20131017110136/@comment-22525977-20131027054646

...legally speaking, Regina isn't Emma's step-grandmother because her marriage to Leopold ended with his death, at least if you go by U.S. law (which we sort of have to because we have no idea if it works differently in the FTR).

I mean, she's still referred to in-show as Snow's step-mother, but she actually isn't and hasn't been since Leopold died, unless she adopted Snow in addition to marrying Leopold.

/tangentially related fact