Is the money earned by a son working as a tour guide permissible or impermissible for his father, and what is the ruling on his taking commissions that may reach 50%?

The ruling on the tour guide's earnings depends on the nature of his work. If his work is limited to permissible matters, such as guiding people to public places, then his work and income are lawful. However, if his work involves promoting unlawful things, such as guiding people to places where alcohol or prostitution are sold, or allowing impure individuals into mosques, then his work and income are unlawful. Similarly, commissions, if they are for guiding to the sale of unlawful items like statues and music, are prohibited. But if they are for guiding to the sale of permissible items by mutual consent, they are permissible.