sicily yoder's Kevo

I am eager to find a way of contacting my aunt who I believe joined the Amish comunity some years ago. We have had no contact with her since then..We do not know if she is dead or alive .she lived in Kitchener ontario canada my father is 85 years of age and would love to speak to her ....since they last spoke 2 sisters and a brother have passed away leaving only my father and my aunt can anyone advise me on the best course of action ?