Brothers with AML

My brother was diagnosed with AML in November of 2000. My other brother was a perfect match for the stem cell transplant. As they prepared for the transplant last week, my brother, the donor was diagnosed with AML. My family is numb! Do you know of others with multiple siblings diagnosed? Is there any research available for us to read? My sister and I do not match either brother...we have been tested. Any ideas/suggestions would be appreciated...this load is too heavy! Cate