At this point, 3 people with Crohn's one of which is my brother, and while not classified as IBD, I know 5 with coeliac.
I wouldn't say that cases are rising, I would say that diagnoses are rising. We've hit a turning point in society. For centuries men have been told to "suck it up and be a man", and in that exact same period there has been a male dominated health industry ignoring the issues of women because "she's just over reacting, women are crazy". While we are in no way close to an enlightened society, we are getting better with diagnostic tools and methods. I could go on at great length abut this as it spans everything from the alleged "autism epidemic" to the increased rate of lupus in women.