J.P.
As a landlord I would explain the situation and ask for a separate addendum. It is no big deal to make up an addendum to a lease, not for me anyway. I have tenants that asked to have someone else stay with them, they help my tenant with the rent. As long as the house/apartment is big enough for everyone then it shouldn't be a big deal.
Updated
As a landlord I would explain the situation and ask for a separate addendum. It is no big deal to make up an addendum to a lease, not for me anyway. I have tenants that asked to have someone else stay with them, they help my tenant with the rent. As long as the house/apartment is big enough for everyone then it shouldn't be a big deal.