Stapleton was born in New York City to Joseph Murray and his wife, Marie Stapleton Murray, a singer.

NPR: Jean Stapleton, TV's Edith Bunker, Dies At 90

Ms. Stapleton was born in New York City to Joseph Murray and his wife, Marie Stapleton Murray, a singer.

WSJ: Jean Stapleton, Who Played Edith Bunker, Dies

To get the most up to date and comprehensive information, I spoke with an expert in the field, Dr. Joseph Murray, professor of medicine and consultant in gastroenterology and immunology at the Mayo Clinic in Rochester Minnesota.

CNN: Are there degrees of gluten sensitivity?