Good luck to you and your dad.
When people ask me for advice, I usually recommend this fund:
www.skagenfunds.com/Funds-and-prices/SKAGEN-Kon-Tiki/
The return in USD have been 23,4% a year (average) since it started in april 2002. Best year gave +103% (in NOK, 2003), worst -36% (in NOK, 2008).