He sold their house against his father's will.
I'm quite confused as to as what is the opposite of against someone's will in this context.
Is it with someone's consent?
Please tell me the most natural way to express this.
Thanks in advance.
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You have found a very good one yourself but...
There is the question what does 'will' mean. He did it although his dad said 'no'. Or he did it breaking the terms of his dad's will (document). In the latter case, you will probably be inclined to preseve the reference of the document instead of hiding it in the term 'consent'. In that case: