Hi,
I am so sorry to hear this awful news. Lots of lovely suggestions regardidng sending letters and cards which could also be a comfort to his family in time.
I'm going to offer a different view as a parent of teenage donor conceived children. While it is true that some DC children have no desire to meet their donor, I know from experience that they do at least like that door to be available to them should they wish. Some actively search for their donors before they are 18. With this in mind, I feel that deliberately choosing to have a child with a donor who has died could be difficult for your future child. On the other hand, I think a lot depends on how you approach it and you sound like a very thoughful person and a lovely mum. Of course donors will sadly die and this is one of the things that will be faced by many.
I know that this is an agonising decision as you also have the consideration of your other child having a full sibling which can be very important for children, perhaps over and above being able to meet their donor. Only you can make the decision and I just wanted to give a different perspective.
Is there anyway you could access a session of counselling to go through all the issues and to support your family? The Donor Conception Network have a helpline and can signpost to a counsellor.
Whatever you decide I wish you the very best and I am so sorry.
A xxx