Hi Dee, welcome aboard. I don't think there would be any problem with showing all the relationships on the existing profiles. You wouldn't need to duplicate any profiles. After a quick look, it appears that the only relationship missing is to show Bessie and Caleb as siblings, and you should be able to do that. But you do not currently have a parent shown for either Bessie or Caleb, so if you designate them as siblings, the system is going to automatically create an "Unnamed Father Pate" profile in order to keep track of that sibling relationship. If you know one or both of the parents, it would probably be cleaner to create their profile(s) first, and then designate both Bessie and Caleb as a daughter and son of the parent(s).
The harder part is figuring out how to describe the multiple relationships between any two of the individuals. I'll leave that one for somebody else to tackle!