Heh. As I tell people - the miles don't get any shorter or easier if they take longer. The real issue with corrals (and yes, they are basically big, fenced in areas, where the runners are herded into like cattle - hence, corral) is when something like this occurs:
DW and I have pretty different paces. My pace puts me comfortably into the first corral for every Disney race (except the Princess and, presumably, the Tink). DW is slower, and starts typically a corral or two behind me, depending on the race. So, if we were running together, I would drop back to be with her. But SIL (who lives near
Disneyland) is about at my pace for the half marathon - close enough that I could pace her to a PR. But the only way I could pace her would be for her to drop back into my corral (again, for the Princess and the Tink - for other races, we would both be in the same corral). Depending on how they do the separations, she might be able to start at the tail end of hers, and I could catch her, so long as I am in the front of mine.
Anyway, that was kind of long winded. The important thing is that the two of you should have no problem starting together, if you are both at the 13.5 to 14 minute/mile group.