How to work with relationships

[limitless]

Hello there,
I'm just starting to work with ESPO and trying to figure out the system,
I am trying to create a relationship between contracts which are family members - meaning: I want to have the contact card to also display all his known relatives (brother-sister and so on)
I'm assuming i need to do this with another table called relatives (many-to-one) which holds the contact person id and then list of his relative id (another contact person) - can someone please guide me on how i make this happen- i mean, do i create another entity, and if so, how do i like the primary and secondary keys (id)...
Also, is there a way to display the list of relatives (pull the list and then the contact information for each) and display it in a sub-table?
Thank you in advance for the help

[Andorxor]

Just add a relationship with the EntityManager to contact in contact,than go to the DisplayManager under relationships and add it.