Is it essential to be present at the moment a person dies, and what should those who are present do?
Question

                When my father was dying in hospital I was with him all the time. But in moment od death I couldn't be with him.I left his hospital-room and I've never came back.I couldn't see him.Why ? maybe I was scared.Now couple years after that I feel gilty, every day more and more.I said myself that I wasn't good daughter. Could you tell about proriety behavior muslim daughter in the moment of death her parents and after that.
Praise be to Allah.
    If you are present at the death of one of your parents or 
    relatives, or others, then it is Sunnah for those who are present to remind 
    him to say the Shahaadah. When he has died and his soul has departed, they 
    should close his eyes, because when the soul departs the gaze follows it. At 
    that point it is not permissible to panic and wail and so on. 

    If a person is unable to stay with the one who is dying, 
    because he is afraid and is not used to seeing such things, there is no sin 
    on him, but he should try to get used to such things because it will help 
    him spiritually. It may be an individual obligation (fard ‘ayn) upon 
    a person if there is no one else available, in which case he will be sinning 
    if he does not do it.

     Shaykh ‘Abd al-Kareem al-Khudayr.

     If there is no one else available to close the eyes of the 
    dead Muslim, then cover him, then wash and shroud him, apart from one 
    Muslim, then it becomes obligatory for him to stay with his deceased brother 
    in order to fulfil the obligations towards him. But if there are Muslims 
    available who can do these things, the other Muslims are absolved of 
    responsibility.

     It is prescribed for those who are present when a Muslim is 
    dying to recite Soorah Yaa-Seen for him, for that makes it easier for the 
    soul to depart and makes the dying person more steadfast, as it did in the 
    case of some of the Sahaabah to whom it was read.

     After the person has died and his soul has departed, it is 
    not prescribed to read Qur’aan over him; rather it is prescribed to make 
    du’aa’ for him and pray for forgiveness and mercy for him and for him to be made steadfast when being questioned in the grave.

     And Allaah knows best.