Thanks again for responding. As Jelena says (thanks, Jelena!) and as I mentioned in my original post, I did not include links to the profiles since they are Unlisted (you can't see those profiles if you are not on the Trusted Lists of those profiles).
If, as you indicate, the Unlisted child's names, birth date, and birth location are intended to be displayed on the parent's profile in this situation, then I believe that the description of Unlisted on the Privacy Help page needs to be updated to reflect that.
In this case some of the private information entered on a profile is not "entirely hidden from everyone except those on the Trusted List" of that profile. The profile manager that added me to the Trusted List of the Unlisted parent's profile wanted to me to be able to see the private information entered on that parent's profile. But the profile manager of the Unlisted child's profile (which may or may not be the same profile manager as the parent's profile) may not want the names, birth date, and birth location of that child to be disclosed outside of the child's Trusted List. The profile manager of the child's profile may not be aware of the visibility of that info since the Unlisted Privacy Help description indicates that private info is entirely hidden based upon the Unlisted setting on the child's profile. The profile manager may need to remove/anonymize that info in the child's profile, if he/she doesn't want it to be visible as in this situation.