"R-U106>Z381>L48>Z9>Z2>Z7>Z8>Z1>Z346>Z343>CTS5601
Likely MRCA data range: 1100-100 BC
Likely origin: Scandinavia, likely Sweden
Culture: proto- or early Germanic (if early), north Germanic if later
Narrative evidence: R-CTS5601 shows much stronger Scottish (and, to a lesser degree, Irish) themes than R-FGC11784, or much of the rest of R-Z8 as a whole. It remains strong in England, though only typically so compared to R-Z381 as a whole. In continental Europe, it is strong in the Netherlands, and moderately present in Germany and France. In Scandinavia, it is very strong in Sweden and Finland, and present in Norway. Sporadic returns are seen in eastern Germanic branches, but this is very much focussed towards north Germanic areas, with some western Germanic migrations happening later. Consequently, it appears that this predates the major split of the Germanic peoples into their three traditional branches, but has latterly become most associated with the northern Germanic groups."
So CTS5601 predates the split of the three traditional branches of the Germanic people. What are the three branches that you're referring to here, Iain?