Contacting siblings when a woman denies she is 'the' first mother

Diving in the unknown....                      photo by Ken Robbins

What do you do when a first mother denies she is your mother, but the proof that she is seems irrefutable? What do you do about siblings, cousins, aunts, uncles, other family members? Do you contact them?

The question comes up often because it happens all too often. Recently I met a woman in her sixties who believes she found her natural mother, but the woman, now quite elderly, wrote back that she was not the person being sought. However, if the woman is the birth mother--as the records obtained by the adoptee indicate--the adoptee may have full siblings. And she would love to know them.