Summary of a Q&A in Billed Bladet #41, 2013.
Q: What is the relationship between the DRF and the Rosenborgs?
A: Their relationship is fine but they don't associate much and never have.
During the debate leading up to the change in the Law of Succession in 1953, the later Frederik IX and Queen Ingrid did what they could to protect their children from being affected family-wise.
As has been pointed out elsewhere, the change in the Law of Succession was the will of the people and the politicians with the DRF being somewhat relegated to the role of spectators.
- It is however no secret that there was a considerable bitterness in Prince Knud towards the rest of the DRF.
And that it was Count Ingolf of Rosenborg who, despite being cursed with a looks like a village idiot is no fool at all, was instrumental in reconceiling the two branches of the family. - But they still don't associate much.