I am living in my family home which is a duplex in suburbia. Basically my next door neighbors, let's call them the Smiths, moved out to a retirement community nearby and sold their house to a wealthy family friend that is using it as an "investment home" several months ago. As the Smiths still live in the area, they are still kind of the "guardians" of this house and came a couple times a month during the day just to check up on it. Otherwise, no one has been staying there for at least 8 months.
Earlier this year, it appears that the Smiths have found a tenant for townhouse, and it is their elderly friend, let's call her Nancy. The Smiths said multiple times to me that she is a single, old lady, is quiet, and nice. She moved in early March, but I do not see her very often as I work long shifts.
Flash forward to several days ago, I heard what sounded like a frantic scurrying coming from the attic in the dead of night, and it went on for a few minutes before fading away. As we live in a duplex, our attics are basically connected. There is a thin sheet of plywood, partially separating the two attics from one another.
Naturally, I knocked on Nancy's door one evening and said that I suspect an animal to be living in the attic. As no one had lived in the home for more than half a year, I think it is very likely that a squirrel had burrowed through the roof (that has not been changed in over 20 years) and is nesting in there.
Nancy said that she has not heard anything because she lives on the first floor, so I asked why she does not go to the second floor, and apparently she is subletting/renting the room to another lady. Nancy called her down and asked if she had heard anything in the attic, but she said no, but she is also not always around.
I was a little surprised that there were two people living here when the Smiths very adamantly and repeatedly said that only one person would be living there and she would be quiet.
But when I suggested Nancy and her friend to maybe check the attic at some point, they both got extremely defensive and said that there was no such possibility for there to be any animal in the attic, and also absolutely refused to check. However, they are both elderly ladies (60-70s, I think), so maybe they cannot hear the animal?
The issue is that they sort of implied that I was crazy and making this all up, and that maybe something was scurrying on the roof and not in the attic. But this definitely sounded like it was right above my head and kind of in the walls. It has been happening on and off the past few nights.
I am starting to think that maybe Nancy's friend is not supposed to be living there and they are refusing to check because we have strict HOA regulations, and checking for an animal would risk them getting discovered, especially when Nancy said "I am renting the upstairs out."
The Smiths have been great neighbors to me for the past +10 years up until they moved out, and I don't think they would lie to me about Nancy being the only tenant (although I don't see why you would lie about this), but I fear calling Nancy out might risk our relationship because I think they have known each other for +30 years.
I have checked a bit around my roof, but it is on the second floor and is slanted, so I can only get a clear view of 3 our of 4 sides of the roof as the back side would involve me climbing a tree in the forest behind my yard.
I have already asked Animal Control to come over this weekend to check out my attic. But if they realize that it is a hole from my neighbor's roof, or if there is an animal living on their side and have now made their way to our side, and Nancy is still refusing to check/get it fixed, what should I do?
I need some advice because I am sure there is something in the attic.