With the growing number of in-laws in my database, I ran into more and more instances where these in-laws were related to each other. For some families, I decided it would be easier to do a bare-bones tree of the ENTIRE family to highlight relations. For many of these families, I discovered links I didn't even know existed.
This is what I would consider VERY PRELIMINARY research. While I tried to make sure the information below is correct, I guarantee that it is not. As always, do your own research (always, always, always).
1 Sebastian Heiligenthal (1819-1893) + Julia Howe (1837-1920) 2 John Heiligenthal (1853-1919) | in-law + Francisca Richter (1853-1878) | (2x)Great-Grand Aunt 3 - Two Heiligenthal children 2 Henry Heiligenthal (1855-1937) + Ludvina Jacobs (1855-1925) 3 - Two More Heiligenthal children 3 Hubert Heiligenthal (1882-1957) + Anna Luke (1888-1970) 4 - Four other Heiligenthal children 4 Edgar Heiligenthal (1925-1974) | in-law + Charlotte Thate (1926-2011) | 3rd Cousin (1x rem) 5 - Seven Heiligenthal children 4 Living In-Law + Living Relative | 3rd Cousin (1x rem) 2 Joseph Heiligenthal (1861-1937) 2 George Heiligenthal (1863-1928) | in-law + Elizabeth Arndt (1872-1934) | 1st Cousin (3x rem) 3 - Four Heiligenthal Children