anyone use Schwab to diversify portfolio of retiree

Hi dad is 97 years old with more than $1M. Never could get him to diversify his portfolio, but now his memory is failing and his monthly expenses will double soon as he needs more assistance. Want to shore up what he has; I have POA. Currently 86% in a REIT , 5% in stocks, the rest in cash. I know there will be tax implications. Anyone have experience with this? Considering a fee only advisor but hate to spend the $.