| Descent |
| Thomas Cassingham (Sr.) |
| Richard Cassingham |
| George Benjamin Cassingham |
| Emma (Cassingham) Brown |
| John Lloyd Brown |
| Marjorie R. (Brown) Shneidman |
| Joan Leslie Shneidman |
Joan Leslie Shneidman is the daughter of Marjorie R. Brown and Arthur Shneidman. She was born in 1943 in California.
In 1969, she married David L. Willingham. He was born in 1938.
Children of Joan Leslie Shneidman and David L. Willingham:
- Alexander L. Willingham was born in 1975 in California.