NO, NOT IN TROLLVILLE.
this was explained to you......having someone living there who is NOT ON THE LEASE is a lease violation and grounds for eviction.
if you don't have the mental capacity to understand, contact adult protective services, they can have you declared legally incompetent. Then you can have the 2nd person live with you as a disability accommodation.
it is true that limited areas require a landlord to allow a roommate, but even in NYC, technically, you are supposed to get the landlord's permission....in reality it is highly doubtful a court would evict if you don't, roommate will just be required to get approval. the landlord can only deny for a very good reason such as the person is a former tenant who trashed the building.
BUT IN MOST AREAS, LL does not have to allow a roommate.
most landlords would be required to allow a parent to move their minor child in.
some states have allowances for immediate family members
(or are you just trolling by reposting someone elses question?)