Should he give precedence to his father over himself with regard to the price of the udhiyah so that his father can offer the sacrifice, by way of honouring him?
Question

                My father does not have enough money to buy the udhiyah, and I usually give him the cost so that he can offer the sacrifice instead of me. Is this good (as a way of honouring my father), or should I offer the udhiyah because I am able to do so, and there is no blame on my father?
Praise be to Allah.
    Firstly: 

    Offering the udhiyah is a confirmed Sunnah; 
    for it to be prescribed and encouraged it is stipulated that the one who 
    offers the udhiyah should be independent of means, in the sense that the 
    price of the udhiyah is surplus to what he needs to suffice himself and 
    those on whom he is obliged to spend. 

    Please see the answer to question no.
    70291. 

    If a person does not own enough to pay the 
    price of the udhiyah, surplus to what he needs for his expenses, then he is 
    not obliged to offer an udhiyah. 

    Secondly: 

    If the members of a family share 
    accommodation and expenses, one udhiyah is sufficient on behalf of all of 
    them. 

    The scholars of the Standing Committee 
    said: 

    If the family is large, but they live in 
    one house, then one udhiyah is sufficient on behalf of all of them, but if 
    they offer more than one, that is preferable.

    End quote from Fataawa al-Lajnah ad-Daa’imah 
    (11/408) 

    Shaykh Ibn ‘Uthaymeen (may Allah have 
    mercy on him) said: 

    The inhabitants of one house may share one 
    udhiyah even if they are many. If they are brothers who eat together and 
    live in one house, then they may share one udhiyah, even if they have many 
    wives. The same applies in the case of a father with his sons, even if one 
    of them is married: they may share one udhiyah. 

    End quote from Majmoo‘ Fataawa wa 
    Rasaa’il al-‘Uthaymeen (25/43) 

    See also the answer to question no.
    96741

    Based on that, if you live in the same 
    accommodation with your father, then one udhiyah is acceptable on behalf of 
    the entire household, including your father and your mother. 

    The scholars of the Standing Committee 
    were asked: 

    If my wife lives with my father in the 
    same house, is it acceptable to offer one sacrifice on ‘Eid al-Adha for 
    myself and my father, or not? 

    They replied: 

    If the situation is as you describe, and 
    that the father and his son live in one house, then one udhiyah is 
    sufficient on your behalf and on behalf of your father, your wife, your 
    father’s wife and all the members of your household, one udhiyah in 
    fulfilment of the Sunnah.

    End quote from Fataawa al-Lajnah ad-Daa’imah 
    (11/404) 

    There is nothing wrong with you giving 
    your father the price of the udhiyah so that he can take care of that, and 
    you can intend when doing that to delegate him to do that on your behalf and 
    on behalf of the family. 

    There is also no reason why you should not 
    give him the price of the udhiyah as a gift, so that he can offer the 
    sacrifice on his own behalf and on behalf of the members of his family, 
    including yourself and those who live with him in the same house. However it 
    is preferable for the udhiyah to be offered in your name, so long as you are 
    the owner of the wealth, and to give your father whatever he needs of that 
    wealth. 

    But if you live in a house on your own, 
    and your father lives in another house, then it is not prescribed for you to 
    offer the udhiyah on your own behalf and on behalf of your father. So you 
    should offer the sacrifice on your own behalf and on behalf of the members 
    of your household, and your father is not obliged to offer the udhiyah if he 
    does not have enough money to buy it. 

    If you give him the cost of the udhiyah 
    sometimes, and you yourself offer the udhiyah sometimes, that will be good, 
    in sha Allah, and it will be a way of combining the two good deeds. 

    See also the answer to question no. 
    
    41766. 

    And Allah knows best.