Occupancy limit and noise complaint regarding Tenant and guests

[Kerry Arm]

I currently own a few rental properties in the state of CT and the good thing is, all of my tenants pay their rent and mostly on time. 5 months ago, I agreed to rent the 2nd floor to one of my properties to a family of 5. A few days ago, that tenant called me and told me his adult son, wife, baby and wife's brother will be staying with them for a few days because their home caught on fire. Our lease agreement only allows for guests to be on the property for no more than 10 days. Tuesday will be the Tenth day and the tenant told me his son will only be in the home for a few days because the Red Cross will assist  them in finding a new home. Am not sure how this process works and I don't want to be insensitive to their family's situation but I need the rules we set in place.

I plan to request an update from the Tenant Sun night regarding their son and his family situation. I also want to be sensitive in my approach and would like to know if anyone ever encountered this issue and how did you deal with it?

Additionally, the 1st floor tenant is complaining to me about loud noises coming from the 2nd floor, throughout the day and especially at night. They went as far as telling my maintenance guy they may consider leaving because of the constant noise. The first floor been there longer and pays more, they are also quiet.

What is the best way to communicate these issues to the tenant without making things messy between myself and the Tenant, as well as the two neighboring families, (1st and 2nd floor)? 

Thanks in advance to all and any guidance would be greatly appreciated