This could be

Tom Rush
Jennifer Rush
Frank Marino and Mahogany Rush

But it is in fact about Rush, from Toronto, Canada: Geddy Lee, Alex Lifeson and Neil Peart. A mighty musical chameleon of a band who have transformed themselves from Heavy Metal, to prog rock to AOR to survive 30 years plus in the business.

I am a fan and have seen them a mere four times. A friend of mine is such a fan that he named his son Geddy.

Apart from a few bars here and there, in no way could they be rgarded as playing folk!