Is a mortgage transaction made by a guardian or judge involving the orphan's property with their *mukatab* (freed slave under contract) or adult son valid?

Primary text

The mortgage of the orphan's property by the guardian (*Wasi*) or the judge (*Hakam*) to the guardian's *mukatab* or adult son is valid. This is because the guardian has no legal authority (*wilayah*) over these specific individuals; therefore, the transaction is permissible.