What is the ruling on a father buying machines stolen from a non-Muslim, and what is the ruling on the money taken from it and invested in trade?

It is not permissible to purchase stolen goods, even if they were stolen from a non-Muslim. Such goods are considered unlawful wealth, and it is not permissible to acquire ownership of them by any means. Whoever knows that goods are stolen must condemn the thief, ask him to repent and return them to their owners, or report the matter to the responsible authorities. Anyone who buys stolen goods while knowing they are stolen commits a sin, and part of his complete repentance is to return them to their owners and claim the price back from the seller. Buying from a thief is considered aiding in sin, encouraging him, and abandoning the duty to condemn. Furthermore, it invalidates the sales contract because the thief does not own what he sells. As for taking money from one's father, it is permissible unless it is the very stolen money. One must advise the father to seek lawful earnings.