If we wanted Fry to have a sibling with the same age difference and my sister and I, we'd have to get pregnant this month.
AHAHAHAHAHHAHAHAHAHAHHAHA- *gasp* -AHAHAHAHHAHAHAHHAHAHHA!
My parents did have their reasons, though. My mother, an only child, had read that siblings close in age tend to be very close growing up, so this is why she and my father, the oldest of four (plus two half-brothers that are 20+ years younger, which has no bearing on this story but I feel awkward not mentioning them for some reason) planned to get pregnant ASAP. Consequently, my sister and I are 13 months apart in age.
Now, this may work for some siblings, but it didn't work for us. I'm glad to report that my sister and I get along like gangbusters today, but not so much when we were kids.
So yeah, maybe when Fry's 13 months old we'll start talking siblings, but until then...