I agree with the others about the Health Care Power of Attorney for both of you naming the other as the person to make health care decisions in case you can't. I would also suggest you each do a Durable Power of Attorney naming the other person so they can make financial and care decisions, as well. I needed the Durable Power of Attorney to admit my Mother into a nursing home so I could sign the paperwork since she could not.
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After DH's next to last stroke, I had the Power of Attorney (made out by our lawyer) which gave me the ability to choose his nursing home and what treatment he wanted (that he had signed at the lawyer's office). Having all these papers ready really did cut down ANY flack that might have otherwise come from his kids from first marriage, but they read the papers and then agreed with everything I did. Nice people, thanks to a forward thinking Dad. All through our marriage he made sure I knew what was what and we discussed all this for years, just in case.