You need to give more specific information. It is impossible to tell by your brief description what is going on. How old were the members of this family when they found out about their cancer? People can get lung cancer without ever smoking. Colon cancer and some forms of breast cancer can be hereditary. Since no one else in the neighborhood seems to be affected, it may be that the family is dealing with an hereditary cancer (s).

You might want to follow up with genetic risk assessment and counseling just to be sure:

http://www.cancer.gov/cancertopics/prevention-genetics-causes/genetics

As for environmental factors, you can check your states cancer registry to see if there are other indications of cancer clustering in the area.

National Program of Cancer Registries

http://www.cdc.gov/cancer/npcr/

Surgery for Lung Cancer (Part 1)

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I saw the doctor in December for a checkup. everything was done under the sun unprotected and she said im fine no cancer, he says. sensitivity but I have sometimes in the left chest and a small lump in the throat on the right side just above my collarbone. does not hurt, but just there and I have fear. im coughing up sputum yellow-green with small bits of blood on it. vioce is hourse. when I take a breath deep pain on the left side on the back. but I have thyroid nodules and says my doctor told me that they are so small and nothing to worry about. but are there and I'm worried. if there is a professional who can tell me something about the nodules and im having these symptoms. I'm scared to death

Here is a great website that can help you if you go here: http://www.mayoclinic.com// Ckpuppers Hope Helps

breast cancer stage IV its spread to my lungs