The paternal relationship between John Krack and his daughter
Katie Iva Crake is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant JS.
The segmental (via DNA segment triangulation) and total DNA shared between JS and other confirmed descendants of JFK is consistent with the expected ranges for their respective relationships. Since JS descends from JFK through John Krack and his daughter Katie Iva Crake, the presence of significant shared DNA between JS 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 John Krack to Katie Iva Crake, and ultimately to JS, confirming this direct ancestral connection through multiple generations.