Hard to say. In archaeogenetic records J2a-Y13128 is not necessarily restricted to Greece. There are Bronze Age and EIA Greek samples but if I'm not mistaken none of them from Greece proper belong to the Y16842 subclade. Y13128 was pretty wide spread in the Neolithic/Chalcolithic as it has been found in the Panonnian plain I think and the eastern Balkans and of course Greece too.Thank you for your reply.
So we are descendants of Greeks ? Do you know how Europeans from the north-west can have a haplogroup from south-west Europe ?