I believe that Charles Menzel was my grandfather's brother. My grandfather lived in East Orange most of his life, and his name was William Frederick Menzel (my father's name was Willian Frederick Menzel Jr.). I have a very old family tree diagram around here somewhere, and I distinctly remember the name Nelson on it.
I also noticed that you posted Dorothy Menzel's obituary, which was a bit alarming to me, because I have a 3 year old daughter by that name.
It seems highly likely that we're related. Please writeback and I will be happy to share whatever information I have.
Look forward to speaking with you, Scott William Menzel