There are several legal documents that it might be wise to create in addition to a will. My sister (an ICU nurse), has been agitating recently for us to think about creating some kind of "advanced healthcare directive"[1] as she sees many cases where lack of this is problematic. My mother (retired, getting older) also wishes to set up an "enduring power of attorney"[2] as another relative had a fair amount of trouble last year due to not having something like this in place before the time of need.
[1] https://en.wikipedia.org/wiki/Advance_healthcare_directive
[2] https://en.wikipedia.org/wiki/Enduring_power_of_attorney
I might add (as I'm going through it right now for the first time at 44 with my hetero domestic partner) to consider writing a last will and testament. Some lawyers' fees attached to it, but a sound thing to have as a contingency. It also forces you to think about your values.