To convert the sentence into passive voice, you must change the focus from the subject performing the action to the object receiving it (in this instance, "money" is the object that is "earned").
Another important thing to remember:
When a sentence is in passive voice, it tends to imply that the action is being done indirectly. So, once the phrase is rephrased to passive, it may seem like "money" is initiating the act of "earning"; however, we know that it's actually the "father" who is responsible.
The money was earned by Father for all of us.
Hope this clarifies!
~Just a girl in love with Shawn Mendes
