Nephthys Fhang

I may have accidently deleted one of my groups that owned my parcel of my land. Someone tried to rent my parcel from me today and I could not find the group to the add them to. I figured I must have deleted it by mistake. The group now has no owners and I have no rights to the land. Is there any way for me to recover my parcel now that the group no longer has any owners? And does anyone know if I can get the group back?