My father is haunting my mother.

[Mikkel]

You know your father best, but he doesn't sound unhappy or anything like that to me.
It sounds as if he is just visiting or looking after your mother.

[Andara Bledin]

Quoth ralerin

...I have had one or two or several "steal" my energy from directly out of where my heart is (think very painful crushing/stabbing sensation plus the sensation that someone is inside a place that is very deep and precious and should never be touched)...

I don't doubt any of what you've posted, but this sounds an awful lot like the symptoms of heart attack in women. Men get the easy 'omg, it's a heart attack' symptoms, but women get the easier to miss or write off symptoms because they're similar in a lot of ways to a lot of other, less-serious (or less medical) issues.

^-.-^

[Eireann]

Can you set up a camcorder outside your house, facing the woods? Those noises sound extremely weird.

As for your father, I have a feeling he's there to counteract the other forces. From what I understand, he didn't pass away in the house, though of course, he has an emotional attachment to it and, of course, to your mother. Even with the weirdness abounding, it doesn't sound like the other entities have caused harm to anyone. Fear, yes, but no physical harm - and one of them even alerted you and your father to your mother's state of health.

Grief does weird things. Very weird things. It causes you to think things you wouldn't think, under any other circumstances.