My friends family memebers every had a cancer. would it be possible for him also cancer there?

Yes: Cancer is common. Lifetime risks: 1 in 3 for women & 1 in 2 for men of developing cancer. That said, cancer is not an even distribution in the population, so some families have very little cancer and some have a lot. Part of that may be random or statistical chance and part may be shared risk factors in the environment and/or genetics. A good family history and possible genetic counselor can help.

Genetic Testring: Depends on the types of cancers. There are tests for some hereditary syndromes ( ie: brca, lynch). Check out www.Myriad.Com