No lease/no English, realtor says tenant will be out b/f closing

[Mary Jay]

There is a good deal on the market, Its a SFH, tenant does not have a lease and the tenant does not speak English. The landlord is not willing to sign a lease with the tenant. But even if they wanted to sign a lease, since the tenant does not speak any English the lease would have to be in the tenants native language, which might not stand in court.

The realtor is promising the tenant will move out before closing. The realtor does not seem like she knows the law super well (English is not her first language either)

I dont know if I trust the whole situation.  

I am worried that the seller has a verbal lease with the tenant saying: Dear tenant, you can move out for 2 weeks while we are going through closing but then you can move right back in and live there forever for 1 dollar per month.

Are there any ways to make sure the tenant move out forever?

State is Florida

Thank you!