My mom died from colon cancer so did her mom. My mom's sister died frm breast cancer and brother died from lung cancer. How likely am I to get cancer?

Varies. You should see a genetic counselor who can look at your family tree and give you a better idea. The most worrisome possibility from what you have described is so far would be lynch syndrome, in which calling cancer (and others) run in families. You should definitely get a colonoscopy if you've not done so yet. For more info www.Askyourgynecologist.Org.
Family history . The risks of cancer depend on whether there is an abnormal gene that is inherited or a family grouping not related to a specific gene. It would be important to look at the entire family tree and decide about genetic testing or other risk reduction measures.