Provided that you have confirmed that they are NOT related in any way ...
Short Answer: NOTHING, you do not have to do anything with them.
There is NO requirement to CREATE "Unrelated" (ie. "Unconnected") individuals/persons in "Family Tree" of 'FamilySearch', just because they are associated with your Ancestors or Relatives through (ie. on) a Census (or, any other "Source" for that matter).
The associations are almost countless (eg. Visitor; Boarder; Governess; Servant; Cook; Nanny; Nurse; Apprentice; ETC; Etc; etc ...).
You can go ahead and CREATE them as "Unconnected" individuals/persons in "Family Tree" of 'FamilySearch'; IF, you wish or so desire; and, have them time to do so; but, many of us DO NOT have the time, we have enough to do with our own Ancestors and Relatives ... still ... it is your choice ...
Other Users/Patrons will have a different opinion ... each to their own ...
Again ... your choice.
ps: If it is to do with "Unfinished Attachments' SIMPLY "Dismiss" them.
pps: They can still be found and associated with the particular "Source"; if, you "Dismiss" the accociation from your Ancestor or Relative.
Thank you. That pretty much covers everything.