All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
With regard to the money that your father is asking you for, if you are able to give it to him – without subjecting yourself to any hardship due to that – then you are obliged to give it to him as it is permissible in Islam for a father to take what he needs from the property of his children, if they own what exceeds their basic needs. In fact, the Hanbali School of jurisprudence is of the view that it is permissible for the father to take from his children's property even if he is not in need. In both cases, the matter is conditioned on not transgressing the property of the children or harming them. Ibn Qudaamah said in his book Al-Mughni: "The father can take from the wealth of his children whatever he wishes and he can own it; this is whether or not the father needs what he takes, and whether the children are old or young with two conditions: The first is that the father should not wrong the children or cause harm to them, or take something from them which they need. The second condition is that he should not take money from one child and give it to another." [End of quote]
If you cannot afford to meet your father's demands, then you are not sinful in failing to do so and this is not disobedience to parents. The jurists clarified that the obedience to parents is not absolute; rather, it has limits which you can refer to in Fatwa 131695.
In any case, you should try to please your father and not anger him, and you should gently ask him to excuse you.
On the other hand, if a Muslim finds a job whereby he fulfils his needs and the needs of the people whom he is obliged to provide for, like the wife, parents and children, then he is not obliged to look for another job, as the son is only obliged to earn what fulfils his basic needs and the needs of anyone whose cost of living he is obliged to pay, and pay his debts if he has any, as the Prophet, sallallaahu ‘alayhi wa sallam, said: “It is enough a sin for a person not to provide means of sustenance to his dependents.” [Ahmad and Abu Daawood]
It does not necessarily follow that the problems that a Muslim faces at work are due to a sin that he has committed; rather, it could be just a test and if he is patient and seeks the reward from Allaah for it, then Allaah may raise his rank and wipe away his sins on account of that. For more benefit, please refer to Fatwa 83577.
Finally, it should be noted that the parents should not be a source of burden and distress for their children as this contravenes the natural human disposition of compassion for one's children and the desire for their comfort and well-being.
Allaah Knows best.