Can he tell lies to his parents in order to increase their good deeds?
Question

                When I get some money from my father or mother, I give it in charity and keep a little. When I ask them for money they say, “Where did your money go?” I tell them a lie and say that I bought stuff with it. The reason why I tell this lie is that I want Allaah to increase their good deeds. Is it permissible for me to lie to them or should I tell them the truth?.
Praise be to Allah.
      The basic principle concerning telling lies is that it is 
      one of the signs of the hypocrites, because the Prophet  (peace and 
      blessings of Allaah be upon him) said: “The signs of the hypocrite are 
      three: when he speaks, he lies, when he makes a promise he breaks it, and 
      when he is entrusted with something he breaks that trust.” Narrated by 
      al-Bukhaari, 32; Muslim, 89. 

    But there are some instances in which Islam permits lying, if 
    that serves a greater purpose or wards off a greater harm: 

    These cases include the following: 

    1-When a person is intermediating 
    in order to bring about reconciliation between two disputing parties.

    2-When a man speaks to his wife, 
    or a wife to her husband, concerning matters that will increase the love 
    between them.

    3-War.

    It was narrated from Umm Kulthoom bint ‘Uqbah that she heard 
    the Messenger of Allaah  (peace and blessings of Allaah be upon him) 
    say: “He is not a liar who brings about reconciliation among people, conveys 
    good words and says good things.” 

    Narrated by al-Bukhaari, 2546; Muslim, 2605 

    It was narrated that Asma’ bint Yazeed said: The Messenger of 
    Allaah  (peace and blessings of Allaah be upon him) said: “Lies are not 
    appropriate except in three cases: when a man speaks to his wife to please 
    her, telling lies at times of war, and lying in order to bring about 
    reconciliation between people.” 

    Shaykh al-Albaani said: it is hasan. 

    What you have mentioned is no excuse for telling lies to your 
    family. If you are honest with them they will never be deprived of the 
    reward for spending on you. And you can combine your family’s spending on 
    you and their giving in charity to the needy by encouraging them to spend 
    for the sake of Allaah, with no need to tell lies about buying stuff when 
    you have not done so.  

    We ask Allaah to correct your intention and set your affairs 
    straight, and to reward you greatly for your desire to benefit your family. 

    And Allaah knows best.