Miriam Altman is the daughter of Bernnard Baruch Altmann and Hanna (Seeberger) Altmann, based on a family tree compiled by her cousin Michel Altman. A 2005 back issue of the Vancouver Sun has a “Miriam H Yaniv” of Surrey thanked for a donation to some cancer fund. I’m inclined to think this is our Miriam; perhaps the H is for Hanna after her mom.
It should be noted this family tree is pretty thorough and current with other family members contributing but makes no mention of Miriam having a sister. More on that later.
With Miriam and Yitshak emigrating to Canada around 1984, I assume at some point after that her parents came over. Hanna died in White Rock, Surrey in 1997. Bernnard died in 2006, no place of death listed but most likely happened in BC based on her tribunal comments about their burial.