You could probably add me to that tree of yours. My Angwin side goes as such..

Susan Clifton (b. 1942, New Jersey) married Edward Konstant (b. 1936, New York);
Anne Halpern (b. 1921, New York) married to John H. Clifton (b. 1918, Illinois);
Grace Angwin (b. 1898, New Jersey; d. 1990, Florida) married to Harry Halpern (possibly Halperin; b. 1898, Russia; d. 1983);
George T Angwin (b. 1864, Penzance; d. 1930, New York) married to Jane Clemens (b. 1865 Penzance; d. 1930 Pennsylvania);
Richard Angwin (b. 1842) married to Grace Trewern (b. 1840)

I have not researched beyond this point, but that is next on my list.