Need a month to month Tennant out in ny

[Matt Nervegna]

Hey I just bought my house around a year and a half ago with a Tennant in a downstairs apartment . He is month to month no lease I now need the downstairs for a family member who lost a job and needs to stay with us so I told the Tennant he has 2 months until I need the apartment. By law I only need to give him 30 days. He requested to stay until the summer unfortunately I need the space in March. I explained to him that I would give him the month of February for free to help him financially and that it has nothing to do with him that he can use me as a reference wherever he goes next. What is the proper way In Long Island ny to serve a month to month Tennant incase our verbal agreement doesn’t stand and he tries something funny ? Thanks in advanced