Reblooming OP seedling from "MR1"

This is the only seedling I've raised to bloom from "MR1" - which is ('Fragrant Cloud' x Rosa carolina) X 'Carefree Sunshine'. I should have had a lot more by now but haven't done a great job of it. Anyway, this lone seedling isn't any healthier around here than the average Hybrid Tea or Floribunda, but it does repeat bloom and isn't too many generations away from Rosa carolina.