Thanks for the replies fellas! I'll look into the problem a bit further.
Part of the problem is the suspicion of mold without much evidence where we can see it. There are a few black dots coming up through the carpet in a few areas that look like mold but no obvious stains on any walls, ceilings, or floors. My grandmas has some trouble breathing , but it seems to clear up if she is away from the house for a couple days. It's possible that there's no correlation but it's worth looking into