I found a piece of my family puzzle yesterday!

Susana Wilfong was my gg grandfather's sister. Sometime ago I found this 1860 Canadian census page that shows my ggg grandfather, George Wildfong, his wife Margaret and children :  Susana, Simon, Thomas,
Thomas is my gg grandfather. 

Finding what happened to the sisters is somewhat more difficult unless I can locate marriage records so I didn't spend a lot of time looking for Susana.  I just filed it in my 'to do later' file.  While I was researching Thomas I found a census that showed Thomas and his family and noticed that there was a William and Susana Horn that lived very near them.  I know that for family to live near is quite common so I started thinking that maybe this Susana Horn was Susana Wilfong.  They were born approximately the same time.  I couldn't find anything on Ancestry.com so I checked on Familysearch.org.  Their search engine lets you put filters on that are easier for me to navigate.  I entered a search for anyone with the last name Horn with parents William Horn and Susan (unknown maiden name) with the year range that I thought probable.  Up popped several children's birth and marriage records with parents and William Horn and Susan Wilfong!  Yes, there was the proof I needed.  Marriage and Birth records often provide the mothers maiden name and that was all I was looking for, proof that Susana was a Wilfong before she was a Horn.
  Here's the census image referred to above:

1870 US Census image for Huron County, Michigan