Do you guys think it is rare for a family to have ten granddaughters, all girls and then the…

Do you guys think it is rare for a family to have ten granddaughters, all girls and then the eleventh a boy? My husbands siblings have ten girls between them and then his brother just had the first grandson (eleventh grandchild and younger). I never thought this was that unusual, but I happened to run across this app solely about congratulating a woman on having the first grandson after ten girls which would be my husbands families situation. This was my SIL's first born as well as the lady's in the article