emmaa I highly doubt if both you and your mom both have CD it's only coincidental, regardless if your CD is quite different in behaviour
than your mom's, research has shown there is a genetic component/link for IBD it's just not completely understood how as it is with something like MS, there are many cases referred to as familial IBD where nearly every family member suffers with an IBD (either CD or UC), my mom has UC and I have CD, that's genetics.
It's estimated by researcher that if one parent has an IBD (UC or CD) there is a -10 to -15 fold increased risk that their offspring will also get an IBD.
:)