The father has to be just to his children, regarding the money he gives them, bearing in mind that the share of a male is twice the share of a female. The Prophet (peace be upon him) said:
Fear Allah, and be just to your children.
The father is required to give the sons working with him payment in return for their work if they ask him for this, like what he does with the other workers. Those who contributed their own money in building the house are to be his partners, each according to their contribution. The father should be just regarding the money he gives to his children, whether to those living with him or those who are not and those working with him or those who do not. The Prophet (peace be upon him) ordered Muslims to be just to their children in their grants; he even described the act of differentiating between them in grants as Zhulm. Hence, the father must fear Allah regarding this matter. (Part No. 16; Page No. 224) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.