They would not be giving blood transfusions unless the level of anaemia made them essential; he clearly has advance disease, and I cannot imagine any alternative at this stage ... But it would be useful to know where he's losing blood (if he is), whether he'd be fit for surgery (if that would help).
I think it's time you sought a meeting with his consultants and ask them to give you a full account of how serious his condition is, and what the future holds. It will be a difficult interview, maybe even stressful - but I suspect you'd benefit from understanding what they are doing and why.