I did not complete all the rituals of Hajj for some of my young daughters because of the crowdedness and fear of infectious diseases

Q 1: I performed the obligation of Hajj this year, 1410 A.H. With my family members and we were nine in total. Our intention was to perform Ifrad Hajj (performing Hajj only) from the Miqat (site for entering the ritual state for Hajj or `Umrah). However, I did not complete all the rituals of Hajj for some of my young daughters, who were ten, seven, five, and three years old, due to the crowdedness and fear of infectious diseases. I thought that the obligatory act of Hajj will not be waived from them by doing Hajj in this age. Furthermore, I was ignorant of the rulings related to their case, and I did not know what the legal consequences of the (Part No. 10; Page No. 272) incompletion of their rituals of Hajj. Also, I did not ask at the time. When I came back home, someone told me that I have to carry out some duties for my young daughters, since I had initially intended to perform Hajj for them. So, I wish Your Eminence could write to me clarifying what I should do In sha’a-Allah (if Allah wills) and answer my question. I have big worry that I would lose the reward of Hajj for my daughters. May Your Eminence kindly clarify what I should do? May Allah reward you with the best. My ten-year old daughter did not perform Sa`y (going between Safa and Marwah during Hajj and `Umrah), and I do not know for sure whether I threw Jamarat-ul-`Aqabah (the closest pebble-throwing area to Makkah) for her or not. But I know for sure that I threw the other three Jamarat during the Days of Tashriq (11th, 12th and 13th of Dhul-Hijjah) for her.

A 1: You have to go back along with the mentioned daughter and perform Sa'y for her. You also have to slaughter an animal because you neglected throwing Jamarat-ul-`Aqabah for her, unless you are quite sure that you threw the pebbles for her, in which case you are not required to offer a Fidyah (ransom).