The problem with the Canadian birth is why register the birth in Hawaii?
The current Washington law RCW 70.58.080(6) reads “If there is no attending physician or midwife, the father or mother of the child, householder or owner of the premises, manager or superintendent of the public or private institution in which the birth occurred, shall notify the local registrar, within ten days after the birth, of the fact of the birth, and the local registrar shall secure the necessary information and signature to make a proper certificate of birth.”
http://apps.leg.wa.gov/rcw/default.aspx?cite=70.58.080
So why not register him in Washington? They would have the baby and family friends and relatives to verify the birth.
I've postulated this answer before. Stanly Ann was irresponsible. Anyone so irresponsible as to HAVE their child in Canada, (and therefore depriving him of his highly valuable American citizenship) is likely too irresponsible or lazy to have gone to the trouble of registering him in Washington. (assuming you could get witnesses to go along with it. People generally had more integrity back then.)
Madelyn, on the other hand, was the epitome of a no nonsense doer. She didn't mess around, she took care of problems for her irresponsible daughter. (note that Barry lived with Madelyn rather than Stanley Ann from 1971 onward. )
Besides, Hawaii's birth certificate laws were probably the laxest in the nation,(and still are) and Madelyn also did work at the local courthouse and was likely above question or reproach.
It was EASY for Madelyn, and perhaps not so much for Stanley.