This is a longshot movie or TV
So, I'm going to start by saying I can't remember if this is a TV series or movie and I can only remember parts of it and honestly don't even know if I'm combing multiple things. Here it goes.
I remember a house, possibly a one story, but there was a back yard fairly pristine. Attached to the yard was a dense wood.
I think the woods had either a portal in it or some kind of cave where someone found a prisoner eventually. Turned out to be some kind of water queen or something and they freed her and took her back to the ocean.
I also think that they were kids once, then moved away and came back. I can't even remember if the main character was male or female.
I think another scene involved the back yard, and some kind of creature attacked them from the woods and they fought it.
I can see the House and the yard and the woods in my head but just can't remember much else I'm sorry.
As the title says i know this is a long shot. I don't think it's kid friendly. It's live action and I think set in the US.