What is the ruling on the wealth of a father who works in an engineering administration in a private tourism sector, and does the rule of "necessities permit the prohibited" apply to him? And what is permissible for the children from this wealth, and do they inherit it? And how can the father's debt be calculated and paid if he refuses to receive it?

Working in tourism in our current reality involves many Shariah violations, which renders a portion of the father's wealth unlawful, and this is called "mixed wealth." Scholars have ruled that it is permissible to eat from and deal with such wealth, but abstaining from it is more virtuous. The father's claim of necessity is incorrect because lawful avenues are abundant. Consuming unlawful wealth has dire consequences, including the non-acceptance of supplications. As for wealth earned from such forbidden work, some scholars hold that it is unlawful only for the earner, not for someone who takes it from him through a permissible means, citing the Prophet's (peace be upon him) dealings with the Jews despite their engaging in usury. Therefore, you are permitted to inherit from your father, and you are not required to return what he has given you, but abstaining from eating from his wealth is more virtuous if you are able.