What is the ruling on lying to parents to obtain money (such as asking the mother for money for food and storing it for the purpose of travel), what is the ruling on this money, and how can one dispose of it if it has been mixed with lawful money?

Truth leads to righteousness and Paradise, and falsehood leads to immorality and Hellfire. It is not permissible to take a person's property except with his willing consent.

If the son is an adult and capable of earning, it is not permissible for him to take from his parents' money without their permission.

If the father is well-off and the son is unable [to earn] and has no money, and the father refuses to provide the legally obligatory maintenance, then it is permissible for the son to take what is sufficient for his needs, in a reasonable manner, without the father's knowledge, while avoiding falsehood and resorting to allusions.

As for the mother, she is not obligated to provide for the son when the well-off father is present. Therefore, it is not permissible for the son to take from her money except with her permission. If the son lied to her, he must repent by returning the money or seeking her forgiveness, without informing her of the truth.

If the father is absent or in financial difficulty, the son's maintenance becomes obligatory upon the mother, and in that case, the previous detailed ruling for taking from the father's money applies.