Powerfuffbaby, even you are not a Christian, you can also take your 1st step out, pray to the God whereas he is the greatest doctor in the world. As long as you trust in him and have faith on him, there is nothing impossible.
God loves us and that is why he came to this world to save us.
I will put your 姐夫and姐夫的媽媽's situation into my prayer and may God lead.