Legal Question in Landlord & Tenant Law in Massachusetts

Re: Bed Bugs

The landlord is not liable to your mother for the bed bugs unless the landlord's behavior somehow caused or allowed the bed bugs to exist in your mother's condo.

Your legal options would depend upon whether other units in the building are infested, whether the landlord provided the bed and linens to your mother, and whether the bed bugs existed in the condo when your mother moved in, or whether she brought the bed bugs into the home, etc.

I will be interested what others think, but I think the bed bugs are your mother's responsibility and not your landlord's. A note of caution: moving will not solve the problem, as the bugs will follow your mother in her luggage, pillows, sheets, bed, etc.