What happens to child of a single parent if........?

My sister is a single, sole custody parent. She lives with her 1 yr old son with her best friend, another single mom. My sister overdosed 4 1/2 hours ago. What happens to my nephew? My sister lives in Canada and I live in the US, my parents live in South Africa. Her friend has now said that my sister INTENDED on signing legal parents that she would keep my sister's child in case anything happened to her but never did. My sister is on life support and we are unsure if she will pull through. Will Children's Aid or anybody else even KNOW there's a baby at the friend's house? Her friend is on medication for bipolar disease and her husband commutes home every 6 weeks from his job in another province. Will my parents and I be excluded from potential foster parents since we don't live in the country? Her friend is stating her and her husband are willing to permanently adopt Jack and has also stated my sister was well aware that if she relapsed back into drug or alcohol addiction, that Lynn would keep Jack and Melanie would no longer be welcome to live in her home. My sister collects a disability for brain damage caused by her addictions and social istance for her son. The father lives in South Africa and has never seen the child (he's in rehab currently again). Any help would be GREATLY appreciated!