Occupants not on lease

[Brady Fenn]

In one of my units I have a single mom, her son and her friend living there. The mom is listed as the tenant and the son and friend are listed as occupants. The friend has since moved out and another friend has moved in. I have had no problems with the tenant, she’s paid on time and has been a great renter. It’s a duplex and I currently live in the other unit. I’m wondering if I need to go through and update the lease to add the new occupant?