Haircut within Thirty Days in Case of Life-Threatening Situation

A mourner within thirty days for his father, who wants to hide his father's death from his mother due to a life-threatening situation. If he visits her with a grown beard, she will understand that her husband has died, which could endanger her life. Is it permissible to shave?

Nothing stands before a life-threatening situation, and therefore the son is permitted to shave so that his mother does not recognize the death of her husband.

Pitchei Teshuva, Yoreh De'ah, Siman 372, S"K 1: "It is written in the book Chamudei Daniel that one came to his brother within 30 days of their sister's death and did not want his brother to know about it. It seems permissible to wear Shabbat clothes so that he does not have to tell him." And in Siman 393, S"K 7 it is written: "One whose sister died and he observed seven days of mourning, and within the seven days his father came from afar not knowing of his daughter's death, it is permissible for the son to go out to meet him so that the father does not feel the death of his daughter." Thus, it is permitted even within seven days, and what is written "only his father and not his brother" applies only where there is no life-threatening situation, but in a life-threatening situation, it is permitted for anyone who may be endangered by it. See Shu"t Shevet Levi, Part 2, Siman 213.