Is it permissible to accept a suitor who works in a usurious bank as an accounting department manager? And will his money be unlawful and affect the future of the children?

It is absolutely forbidden to work in interest-based (usurious) banks, due to the assistance it provides in sin. The work of a scribe or accountant for usury is more severe and greater, for the Prophet, peace and blessings be upon him, said: "The Messenger of Allah, peace and blessings be upon him, cursed the one who consumes usury, the one who feeds it, its scribe, and its two witnesses. And he said: 'They are all equal (in sin).'"

The money resulting from this work is forbidden, and a suitor who works in it should be rejected, because that would mean that food, drink, and sustenance would come from forbidden wealth. The Prophet, peace and blessings be upon him, said: "O people, indeed Allah is good and accepts nothing but what is good... 'O Lord, O Lord,' while his food is unlawful, his drink is unlawful, his clothing is unlawful, and he is nourished with unlawful things, so how can his supplication be answered?"

The Prophet, peace and blessings be upon him, also said: "Every body that grows from unlawful sustenance, the Fire is more befitting for it."