What is the ruling on throwing the pebbles under the bridge on behalf of oneself and one's paternal aunt due to crowding and fear, knowing that the thrower was an adolescent and did not inform his aunt of that?

Throwing the pebbles (ramy al-jamarat) is one of the obligatory rites of Hajj. It is permissible to appoint an agent to perform it on behalf of someone who is unable to do so. Whoever omits it without a valid excuse until its time has passed commits a sin and is liable for a compensatory sacrifice (dam). If the omission was due to an excuse, they are liable for a compensatory sacrifice (dam) without committing a sin. The dam is the sacrifice of a sheep, distributed among the poor of the Sacred Precinct (Haram). The questioner and his aunt are both liable for sacrificing two sheep, one for each of them. The aunt must be informed of this, because the compensatory sacrifice (dam) is her obligation, and it is not permissible to slaughter on her behalf without her permission.