Corrected entry: In Fuller House we meet Kimmie's younger brother, but in Full House, there was a conversation where Stephanie mentioned in exasperation, "younger sisters" and Kimmie replied "that's why my parents stopped with me."
Fuller House (2016)
1 corrected entry in show generally
Revealing mistake: When Shannon walks into the kitchen and gives Stephanie a hug, in one shot of the highchair where Tommy is sitting there is now a doll.
Kimmy Gibbler: My moves are all that and a bag of chips, so talk to the hand loser! Oh snap, you go girl! I think I just did.
Trivia: D.J. throws a life buoy onto a man which says SS Papouli on it. In Full House, Danny buys a boat and names it this in memory of the family's beloved Papouli.
Correction: She must have meant her parents stopped having daughters; no "younger sisters".
Phixius ★
Not sure this explanation makes sense. When parents "stop" after a certain kid is born, it's likely they would try to prevent another pregnancy altogether - not take a chance on what the gender of the next kid would be. A pregnancy here could have easily produced another sister... just happened that this next offspring was a boy.