Trees are not that related to each other. Woody plants evolved multiple times over earths history. And while e.g. beeches are closely related to oaks related, they are more closely related to strawberries than to e.g. ashes. Black locust tree is more closely related to beans or peas than to birches (which are again related to oaks and beeches). Apples are even more closely related to strawberries than to oaks. That broke my mind during Covid. All conifers are somewhat closely related though.

edit: typo