Lori..........Wonder if you are still out there. Just recently whilst doing a check of surnames I had been doing research on months ago, came across your message, dated Nov 18 2003.
My connection is through Ann Battison, her sister Janet being my ancestor. Was trying to find leads on Ann and her family, and where they had settled in Canada. I now have all the answers. Eventually made contact with a person in Canada, who kindly provided all the details needed.
Maybe you have by now found all the information you require on brothers John and Peter.
Unable to add anything on John, but my Canadian contact thought he had become a doctor.
Peter Gardiner,however married Rickey Mitsner, of German background, 17 May 1872 at Mount Pleasant. Isabella MICHIGAN
They had 3 children. William 1873 Anna 1875 and
Franky, a son born 1879.
I found some of this information on the 1880 US census, and some on th IGI indexes.
Which line of Robert Gardiner's family are your connected to> If you still have questions, I can be found at firstname.lastname@example.org