Hi, don't feel you have to keep checking. You have a profile and when you created it, it would have said.
Add your parents and at this stage I'm sure there are no duplicates. So keep adding the information and then at the bottom of the page - click save/create.
This brings you to a page where you can either look at the profile you just created - or alternatively you could click on edit, or again it gives you the option to add siblings.
For me personally I found as I create a profile - I just go directly into the edit and add any information. Once that's done and I've saved it, then add additional profiles (parents, siblings, spouse etc).