It may be possible to confirm family relationships with Leonard by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Leonard:
Pretty sure their children's name are Thomas Daniel Hults (1913-1990), Martha F Hults (1916-?, sorry I don't know more), Benjamin Lloyd Hults (1917-1992), Bertha S Hults (1921-1931), Cecil E Hults (1922-1998) and Perry Thomas Hults (1926-2003). I hope this helps!