I have UC + IBS + gluten intolerance.
My mum has UC.
One of my sisters is coeliac.
On my mum's side of the family I have cousins and aunts with UC and coeliac.
Everyone carries something problematic in their genes! I think mental illness or cancers would be more worrying legacies. UC is cr*p but it's treatable.
Also, 2 of my sisters have no bowel problems! So, your kids may become ill but they may not
I think my issues were underlying but were triggered by stress and anxiety. So promoting a healthy diet, exercise and a laid-back approach to life (plus teaching coping skills) may help your kids to avoid any underlying UC