Which of the following family histories would NOT prompt an oncologist to check for a familial cancer syndrome in one of her patients:
a. Mother with breast cancer at age 40, Maternal grandmother with ovarian cancer at age 36
b. Sibling with retinoblastoma in both eyes at age 5
c. Father (with history of smoking) with lung cancer at age 65, First cousin (on father's side) with prostate cancer at age 70, Aunt (on mother's side) with breast cancer at age 55
d. The patient herself presents with both colorectal and stomach cancers (Two primary tumors - neither is a metastasis)