The zakah on money taken from one’s father for trade, on the condition that it be returned when requested

The questioner:
The questioner says: I asked my father for permission to take a sum of money from him so that I could trade with it, on the condition that I would return the amount whenever he asked for it. A lunar year has passed while this amount was in my possession, so I told my father, “I will pay the zakah on this amount.” Is that sufficient, or is it necessary that my father pay the zakah?

The Shaykh:
Do you repeat the question?

The questioner:
He says: I asked my father for permission to take a sum of money from him so that I could trade with it, on the condition that I would return it whenever he asked for it. A lunar year has passed while this amount was in my possession, so I told my father, “I will pay the zakah on this amount.” Is that sufficient, or is it necessary that my father pay the zakah?

The Shaykh:
This would be riba (usury or interest) as an increase in the loan; this is not permissible. Yes.

The questioner:
May Allah reward you,