Q. "I am a widow. I have sons and a daughter. We all live in the same house. Our wealth is one, we haven't separated our wealth since the death of my husband. Every year I place one of my sons responsible for buying an animal to slaughter and slaughtering it. Therefore, who is the one who is obligated to refrain from cutting anything from his hair and nails during the ten days of Dhul-Hijjah? Or is it obligatory upon all of us?"
A. "If the reality of the affair is as was mentioned in the question, from them sharing in the wealth as well as the slaughtering of the animal then all of you are considered the one who will slaughter the animal. It will not be permissible for the person to take anything from the hair, the nails nor the skin after the start of the month of Dhul-Hijjah up until the point when the animal is slaughtered. This is based upon the statement of the Prophet (sallallaahu alayhi wa sallam)
"When the month of Dhul-Hijjah has begun and one of you wants to slaughter, then let him not take anything from his hair, nails or skin."
The narration has been mentioned by Imaam Muslim in his Saheeh on the authority of Umm Salamah and with Allaah is all success."
Source: Fatawaa Al-Mar-ah Al-Muslimah V.2 pg. 487
Sisters Upon Al-Istiqaamah