Absolutely. If by "related" you mean like how you are related to your mother or any other person, then yes, you are related to trees. But you - and every other human - is related to every other living thing as well. We all have shared ancestors. My sister and I have a shared ancestor that goes back one generation, to our parents. If I go back two generations, anyone that I share a grandparent with is my first cousin. If a person and I share a great-grandparent as an ancestor, then they are my second cousin, and so on. Go back far enough, and we share an ancestor with every other living thing, including trees.