Sharon, I have made more progress. I think I have a last name for these people. Try Marion & Emily Jane ( Whittemore) VAN ANTWERP.Marion Van Antwerp was there in Henderson, Wexford Co.,MI in the 1880 census. He was living in his father's household-- Jake (John) VAN ANTWERP and they bought land ~ 1884
I know I saw a Van Antwerp living near N Collins, Erie Co.,NY--but I cannot find it in the census again,It must have been ~ 1870. I think Emily Jane Whittemore is the "Janie" mentioned in letters from her cousin, John Josiah Whittemore.If you find anything on these Van Antwerp's I am very interested.I looked through the whole 1900 census line by line for Henderson Twp--but could not find them.
Hopefully you have another way of seaching for that awful period of time 1880-1900.
I will be in FL for the Holidays, so I might be slow in responding. Incidently--sorry my last response duplicated about 6x-=I think it was my computer--certainly I know better! My apologies,,,,,JAN