The paternal relationship between Jonas Gustaf Berglund and his son Frank Granstrom is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant FG.

The segmental (via DNA segment triangulation) and total DNA shared between FG and other confirmed descendants of Samuel Larsson is consistent with the expected ranges for their respective relationships. Since FG descends from Samuel Larsson through Jonas Gustaf Berglund and his son Frank Granstrom, the presence of significant shared DNA between FG and other known descendants of Samuel Larsson validates the generational links along this paternal line.

This supports the conclusion that DNA was passed from MRCA Samuel Larsson through Jonas Gustaf Berglund to Frank Granstrom, and ultimately to FG, confirming this direct ancestral connection through multiple generations.