After that is established - have they shared their intent for these funds after they pass? In other words, if you are sure they will not run out of money you could consider investing more in line with the risk tolerance of the intended inheritors
+1 *if* you make sure this meets with your parents wishes. And share your plan with them.
You should work with your parents, and make sure ALL their financial picture is understood. Something like this might help:
http://www.bankrate.com/finance/taxes/8-steps-for-managing-parents-finances-1.aspxAll situations are different. I am wary of anyone that gives a "DO X, Y & Z" answer.... so you can guess what's next :-)
DO consult your parents current financial advisor, and find out what they think.
DO float your investment ideas to your parents & their financial advisors.
DO consider power of attorney for yourself.
DO ensure they have an up-to-date will.
DO get documentation for advance health directives (i.e. do they have a 'DNR' [do not resuscitate]? etc.)