If a man has the same haplogroup as his maternal grandfather, is he inbred?

[Bobby Martnen]

Because technically he shares a distant paternal ancestor with his mother, which makes him technically inbred.

Or is it too distant of a relation?

[Kriptc06]

likely too distant, for example I am V13 Z5018. If my maternal grandfather was V13 Z5017 the connection would be approx 4K years ago.

[Jana]

I am not a man, but both my parents come from men with I2-dinaric haplogroup (diferent subclade though)

And I am not inbred on DNA test...

[Bobby Martnen]

I am not a man, but both my parents come from men with I2-dinaric haplogroup (diferent subclade though)

And I am not inbred on DNA test...

My paternal grandfather (who was I1 like me)'s maternal grandfather was also I1.

My maternal grandfather is E1b1b, and my mom's maternal grandfather was J2a1b.

I don't know what my father's maternal grandfather was. He was Irish, from Connaught.

[Kriptc06]

My paternal grandfather (who was I1 like me)'s maternal grandfather was also I1.

My maternal grandfather is E1b1b, and my mom's maternal grandfather was J2a1b.

I don't know what my father's maternal grandfather was. He was Irish, from Connaught.

I1 is too broad you would need to now the exact subclades. but it's likely too distant.

[Jana]

My paternal grandfather (who was I1 like me)'s maternal grandfather was also I1.

My maternal grandfather is E1b1b, and my mom's maternal grandfather was J2a1b.

I don't know what my father's maternal grandfather was. He was Irish, from Connaught.

Possible R1b L21 since it is dominant among Irish.

[Bobby Martnen]

Possible R1b L21 since it is dominant among Irish.

I hope I'm not descended from R1b, to be honest.