Looking for info on Carrousel (Grandiflora, Duehrsen, 1950)

I am wondering if anyone has worked with Carrousel. Its one of the parents of Prairie Princess. HelpMeFind states that it is a Zone 4 winter hardy rose.

How well does this rose pass on its winter hardy traits? It seems like a lot of its offspring are not overly hardy. Prairie Princess is but that could be attributed Suzzane as much as anything.

Anyone have an idea of its parentage? Seedling x Margy is what is listed in Modern Roses. Margy doesnt have parentage listed. I wonder what its hardyness stems from.

Is Margy hardy?

From my guess Carrousel is not above average for hardiness compared to typical modern roses. It is planted in a local garden in the Twin Cities among standard floribundas and hybrid teas and is treated like the rest of them.