Tenant Violates Lease Landlord Gives Notice to Quit I had a tenant rent and…

Tenant Violates Lease Landlord Gives Notice to Quit
I had a tenant rent and move into a room in my apartment in August 2007. Since then the police were called to the apartment twice for noise complaints, he sexually harassed me, heavily damaged the floors with scratches, and refuse to clean or maintain the apartment in a reasonable manner. I gave a notice to quit citing that the tenant was in violation of sec. 11 of the Massachusetts Standard Fixed Term Lease (which was signed by both parties). The tenant moved out within a few days and is demanding return of security deposit, which was handled and deposited in the proper manner and which I will return minus a percentage of the cost of floor repairs and cleaning. I want to know if however I want to know if I can demand reasonable damages for part or the remainder of the lease under section 25 of the lease? The term reads: The Lessee covenants that in the case of any termination of the lease by reason of the default of the Lessee, then at the option of the Lessor:
a) the Lessee will forthwith pay to the Lessor as damages hereunder a sum equal to the amount by which the rent and other payments called for hereunder for the remainder of the term…

notice to quit I am the executrix of my dad’s estate.

notice to quit
I am the executrix of my dad’s estate. His home is now owned by the estate. When he died I allowed my sister to live in the house without paying rent. There is no lease but she does pay the utilities. The house is now up for sale and she is refusing to leave. She states she is never leaving and is not returning the realtor’s calls to set up showings.

Is the proper procedure to send her a ”Notice to Quit” giving her 30 days. Followed by Summary Process (Eviction) And Complaint Form. Housing court suggests having both served by a constable or sheriff.

Any suggestions appreciated.