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| Descent |
| Thomas Cassingham (Sr.) |
| James Cassingham |
| James Wesley Cassingham |
| Mary Dell (Cassingham) Lyon |
| Kenneth Cassingham Lyon |
| John Kenneth Lyon |
| John Gregory Lyon |
John Gregory Lyon is the son of John Kenneth Lyon and Rosemary Bass. He was born in 1957 in New Jersey.
In 1985, he married Helen Yeager in Pennsylvania. She is the daughter of Harry Yeager and Harriet. She was born in 1964.
Children of John Gregory Lyon and Helen Yeager:
- Jonathan Trevor Lyon was born in 1988 in Maryland.
- Michael Lyon was born in 1990 in Maryland. He lived only one month.
- Jennifer Kathryn Lyon was born in 1992 in Maryland.