The paternal relationship between Adam Krack and his son
John Krak is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant SG.
The segmental (via DNA segment triangulation) and total DNA shared between SG and other confirmed descendants of JFK is consistent with the expected ranges for their respective relationships. Since SG descends from JFK through Adam Krack and his son John Krak, the presence of significant shared DNA between SG and other known descendants of JFK validates the generational links along this paternal line.
This supports the conclusion that DNA was passed from MRCA JFK through Adam Krack to John Krak, and ultimately to SG, confirming this direct ancestral connection through multiple generations.