FAQ - Why are there blank lines on our membership list?
If a parent purchases a membership that is for 2 parents, membership status is given to both parents on the account. The blanks are contacts that do not have a second parent listed as part of the their account but have membership for that blank person. You can clear these by going to the contact card and removing the membership status for the second parent.
Important note: If you sold the family/dual membership with the intent that it would count as 2 memberships - for your membership reporting purposes, don't remove the blanks. Instead, go to the Contact Record and edit the Secondary person's name so that a name will show up instead of a blank.