Excellent post YG, DH and I got married for this reason. Also, if not married you are not considered next of kin, I believe, you can't register the death. DH was taken critically ill when dd was 6 weeks old, we weren't married then and as a result I couldn't give medical consent for the diagnostic tests he needed and his parents had to drive 250 miles overnight to do it instead. Fortunately he recovered but if he'd died (which was very possible) dd and I would have been in the sh!t.
It's very generous of you to consider others at this time.