My mother has colitis, will i likely get it too?

Not necessarily: It depends on what type of colitis your mother has. There are several different types, some that have genetic predispositions, others that don't. For example infectious colitis and antibiotic-associated colitis aren't inherited. Another somewhat common kind, ischemic colitis, is more related to impaired blood flow and a healthy diet, regular exercise, preventative care can help avoid that.

Depends on type: Some types of colitis tend to run in families. Most peolple with ulcerative colitis or crohn's colitis do not have a family history.