There is not a direct relationship between Fox News and Fox 45. That is true.

But...

Fox 45 Baltimore is owned by the Sinclair Broadcast Group, and corporation with a definite pro-Trump bias, and a history of making editorial decisions pushing stories to the right.

So you can say that Fox News and Fox 45 don't have anything to do with each other in a corporate tree, but the are both pushing the far right narrative because they largely follow the same editorial dictates.