There are 5 different connection options
View profile - Allows adults to see last names and send messages
Edit profile - Allows adults to make changes to the profile. This also means they can see the Scout’s home address, date of birth, swim classification, etc.
View advancement - Allows adults to see the images of ranks and awards the Scout has earned.
Edit Advancement - Allows adults to make changes to ranks and awards for the Scout. An adult who is not a leader cannot approve advancement.
Full Control - All of the above plus can make connection and membership changes. An adult who is not a leader cannot approve advancement.
There are 4 connection types, Parent/Guardian, Other Family Member, Merit Badge Counselor and Adult Leader. One must be set so parents in the unit will have a connection type of Adult Leader to other Scouts in the unit. This does not give the adult the ability to approve advancement. A registered leadership position is required to approve advancement.
View profile does what you are asking. Just make sure the other options are turned off for the connection. This is most easily done via Connection Manager.