Actually there might well be grounds for suing the WTBTS if your loved one dies.
The Blood brochures over the years have DELIBERATELY misinformed members of the risks of blood, they have used out of context and outdated quotes (one from 1672) to show how refusing blood can be advantageous, even working for the survival of a patient and they have threatened those who might take blood with DF, DA (death by Divine decree) ie COERCION. Just as they did with organ transplants.
DF for taking blood was brought in about 1961, as dubs were still taking it, despite the prohibition starting in the 50s. This is evident use of threat to force compliance.
I bet a good lawyer could win a substantial settlement... Bring it on!