My dad is determined to invest his money the same way he did in 2008 and is disregarding giving me the money directly to invest. Any advice?

I work in a financial institution so I am pretty well aware of how to invest his money for a good return. I am willing to invest his money and give him the profit (in order to cover any losses), however my dad refuses to give me his money and is willing to give it to some investment company instead. <br>I am just worried that he may lose his money as he did in 2008 and he is now older and less capable of dealing with this. Can someone give me advice on how to talk to him about this and what points I can use to show that giving it to me would be a better option as I know him better?