Typically you would have a couple or maybe two friends living together, with or without children. There are two ways you can record them. If you have a couple, you can either lump them together as ‘one’ tenant, (ie. John and Jane Smith) or you can put them in separately as two tenants (John Smith and Jane Jones). The latter is perhaps more useful if you have mulitple phone numbers etc for them.
When you create a lease for them, you can also list all the other people who are permitted to live there with them, but who are not signatories to the lease – children, grandparents, whatever. That would just be for your own records and reference, as they would not have their own access to the tenants’ portal.
See also the question about Students and Rooming Houses.