Someone commented that they're wondering if Ted Cruz's mother still goes to Canada to get medical treatment and prescription drugs. It seems that when Cruz's parents 'immigrated' to Canada back in 1967 his father became a naturalized Canadian citizen so that they could take full advantage of the national healthcare system and that even after his parents divorced in 1997, that his mother continued to go to Canada when she needed medical care because it was reported that they still owned some property there thus allowing her to keep her status as a 'landed immigrant', not actually being a citizen, but allowing her some of the benefits of citizenship, like access to the national healthcare system.
Perhaps this is one reason why Cruz never mentions his mother all that often.