Looking for Warren Hanson

Hello My great grandfather whose name was John Julseth had a sister whose name was Ellen and she married Rev. Rudolph Hanson, Ellen died of T.B. in 1913. They had one son whose name was Warren and I am wondering if he could still be alive or not. Warren is my grandmothers only first cousin. Ellen would have been born in Brandon, MN. I have seen pictures of Warren when his mother was still alive and he looks like he could be about 3-5 years old. would appreciate any help! Tim