Ok, not that I give up, I merely cannot find anything (yet) that legally defines the rights as purchaser and/or beneficiary to differentiate which must have the insurable interest.
So Betty, by your explanation you are telling me that I can purchase a policy on you as long as I name, say, your children or husband as bene? but I cannot purchase a policy on me and name my brothers girlfriend as bene? (there would be no financial loss to her with my death)
The other thing in your post that is odd is the fact you required the parents to give permission for a g-parent owner and bene policy on a g-child. What reason would there be for the parents to sign?
If it is a legality then you are saying there are other insurers that are breaking the law by allowing this w/out the parents signature, or; you were requiring something that was not legally required?
Now the insurance company you worked for may or may not have done things a particular way, some of this seems to be by their choice, not by legal requirement or restriction.
But regardless of all of this, basically, there is nothing wrong or illegal about the OP's situation. Agreed?