Can my family sue another family for damage to property if both families own the same property, 50/50?

We have asked the partner to pick up empty shells and live rounds on the grounds surrounding the cabin. He has refused. I picked up over 1600 empty shell casings and multiple live rounds. I figured out that during the summerof 2007 he pumped over twenty pounds of lead into a ravine that drains into a stream on the property. If I turn him into the EPA, my family will lose the property and we cannot afford to battle him in partition because that will cost at least twenty thousand dollars. - Is this your question? Add additional information