Golf Rules for playing partners in competition play?

Can anyone help me please.
I play at a golf course in Scotland and we have a member who never has a good score when playing with fellow competitors, however he has entered some competitions recently and his wife has played with him and marked his card.
Surprise surprise he always comes first or second. Our golf club committee have done nothing about this.
Are there any rules to govern this or does it have to be a local club rule??
His wife has played for a year and has only recently gained a handicap. Any help would be much appreciated.

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