Understanding the Heter of Rabbi Moshe Feinstein

 https://en.yhb.org.il/revivim1002/

A story that Rabbi Riskin told about Rabbi Moshe Feinstein * Even after his wife the Rebbetzin begged him to rescind his halachic permit of artificial insemination due to the terror of the zealots who threatened it and burned his books, he refused to change his mind, due to concern for barren women * Even when a child does not walk in straight paths and respect his parents properly, he should not be deprived of the inheritance on an equal footing with the rest of his brothers