OTTAWA — The son of a Canadian woman believed to be among those held hostage by Hamas in Gaza wants the world to push for an end to the fighting, and says he fears Israel's escalating offensive could end all chance of bringing his mother safely home. "My basic belief is that the military actions don't solve anything," said Yonatan Zeigen. His mother, Vivian Silver, is one of an estimated 229 hostages taken by Hamas during its bloody Oct. 7 rampage in Israel. Hamas fighters breached Israel's defences and stormed into nearby towns like Silver's, gunning down civilians and soldiers...