Yes you can.
How to;
On the side bar menu, select Members Module as shown below.
A drop down menu appears.
On the menu, click on membership management and select list members.
Path to follow;
Members>Membership Management>List Members
Once selected a list of all members as shown below.
On the member list, click on edit to view a specific member`s profile.
Once selected, a form with the member details appears.
On the form, scroll down to the Next of Kin details as shown below.
Click on Add Next of Kin.
A form appears as shown below.
Fill in the form and click on Save Changes.