Does the prohibition on taking hair and nails apply to both the one who sacrifices and the one for whom the sacrifice is made?

Question:
May Allah reward you with good and do you good. A sister of ours, the sender is Su'ad al-Juhani, our sister asks and says: Honorable Shaykh, is it permissible to trim the nails, cut the hair, and comb the hair of women and children when the month of Dhul-Hijjah arrives? Or is it specific to the men who are in charge of the family? Or is it specific to the man who is in charge of the family?

Answer:
Trimming the nails, and removing the hair that the Shari'ah has commanded to be removed, such as the hair of the armpits and the pubic area, all of this is among the characteristics of the fitrah (the innate natural disposition) and among the sunnah (recommended practice) of the Prophets. Likewise, trimming the mustache for a man is among the sunnah of the Prophets, and letting the beard grow and honoring it is among the characteristics of the fitrah and the sunnah of the Prophets. However, when the month of Dhul-Hijjah enters and a person intends to sacrifice on his own behalf, he avoids trimming his nails and avoids taking any of his hair from the entry of the month of Dhul-Hijjah until he slaughters the udhiyah (the 'Id sacrifice) on the days of the festival. This is based on what came in the authentic hadith that the Prophet (peace and blessings be upon him) when the month of Dhul-Hijjah enters until he sacrifices. As for those for whom the sacrifice is made, such as children and wives, there is no harm in their taking from their nails and their hair, because no prohibition has been reported regarding them; rather, the prohibition was reported regarding the one who intends to sacrifice. As for the statement of some jurists that the one who intends to sacrifice or for whom the sacrifice is made should not take any of his hair or nails in the ten days of Dhul-Hijjah, their statement "or for whom the sacrifice is made" has no evidence for it. The evidence is only for the one who intends to sacrifice, as in the hadith. Yes.