I literally don't know where to post this and haven't found anything quite related to it discussed here, not even by a similar situation. I chose here because it's the closest I could think of based on the synopsis that I've provided below.
My parents built a home on land in which the property was disputed. I won't bore you with the details but here are the relevant points: 1) the land legally belongs to my mother and aunt; they are two of thirteen children. 2) My grandfather passed away and because my mother and that particular aunt were with him during the months before his passing and taking care of them - the others were apparently too busy to be bothered [my mother quit her job to take care of him, quit her job mind you, and moved OUT OF THE STATE to take care of him before he died of cancer while on ONE other child visited him in his final years, and even that person visited once; actually, there was someone else, another aunt, who harassed him relentlessly up until the week he died, to change his mind about dividing the property] I was the one who fed my grandfather his last meal and was there with him in the hospital till the day he died. Before he died, there was pushing and pulling to influence him to divide the land according to how his oldest three daughters (who are known to dabble in hoodoo as their grandmother was known as "the hoodoo lady" - one of these three is now deceased, the one who harassed him and grabbed a Bible to talk over him as he lied there in bed, still harassing him, hoping scripture would change his mind), to divide the land how THEY saw fit. 3) Their arguments failed and the land was given to the two children who honored their father the most, leaving the other siblings with no inheritance in terms of land.
^That's the background. This post isn't about land, I simply mention it because it could be relevant.
The house is completed from the ground up on ancestral land, and we're living in it, but there is a problem that I strongly sense, feel, and believe could possibly be the result of some spiritual workings, either by spirits of the land, the rootworking perhaps of jealous sisters, or something benevolent or, likely if this vein is the case, malevolent.
Flies. We have a huge problem with the flies surrounding this house. And I bring this up because, well, there are flies all over the place where we live, but in this quantity, where some SURFACES of the WALLS in the garage are COMPLETELY covered with no space in between to actually see the wall - the mechanism that winds the garage door up and down, every exposed type of wiring and cord and pully-type systems is covered so badly that you can't even see what they're resting on; even this is an understatement of how baldly these flies suddenly appeared when just the month before it wasn't really a problem. We needed a de-fogger to get rid of these insects, and they still somehow manage to hang around, though, admittedly, not as badly.
I've only seen or heard of this conceptualization of events, happening in movies, horror movies, even though I can't really bring a specific one to mind. Something within me tells me that this means something. My aunt lives on the property right next door, and she doesn't have this problem and never did. It's not a dead body because we just got done building the place.
Is there anything that could have something to do with something spiritual or magickal going on that would have this phenomenon go on in the natural. I can only feel that something is trying to get my attention in this house (I'm the only one of us living here who works roots, and my mother's two oldest sisters, the ones who learned from my great-grandmother hoodoo, are aware that I've learned and practice a great deal of it comparatively), whether it be spirits of the land, ancestral spirits, or something -- I don't know. I just hope I've described my situation enough for someone to get the gist of what I am trying to ask. Has anyone ever heard of something like this happening? What can I do? Is there a particular cleanse? Sweeping of basil with salt in the corners? Would divination help to verify certain things (I can't read for myself, but for others, I'm usually pretty good about doing so)? Something else? etc. etc. Burning sage or incense isn't something that I can pull off. If I'm caught doing any type of rootwork, and my parents have made this ABUNDANTLY clear, I will be kicked out... I would have to wait for them to go out of town for a couple of days for something like that.
I greatly appreciate you alls help, thanks

I will utter dark sayings of old: Which we have heard and known and our fathers have told us.