haplogroup

[lilu co]

Hi, I'm trying to figure something out about the paternal haplogroup.
My brother belongs to the r-u152 group.
I have a second cousin match who belongs to the e-m123 group. My cousin`s son also e-m123.
Can I conclude from this that me and my brother are related to the second cousin either through his mother, or through his father but through his father's mother.
Right?
Because if it was through the father of the father, the group would be compatible?

[Jim Barrett]

The Haplogroups would be compatible if the relationship was through the father of the father. With the information provided that is all we can say for sure. Could the relationship through your mother?

[jimbirk]

Second cousins share the same great grandparents.
Just build your family tree for both lines back to great grandparents and you will have the exact answer.