It's nice to see the next generation developing a bit of skepticism. Keep that young man questioning everything! Oh, and there surely is more than one way to invest in energy companies:

Further, your son's question about national leaders investing in energy companies is based on what?  Cheney worked for Halliburton, who is not an energy company but rather a supply and technological assistance firm.  Hell, anyone with a 401k probably has extensive investments in the oil sector. 

Energy Bill Is Payoff for Campaign Contributions

Joe Barton, House Energy Committee Chairman And a Close DeLay Associate, Received $1.8 Million in Campaign Contributions from Energy Industry. Rep. Joe Barton (R-TX) is chair of the Energy and Commerce Committee, which recently passed the energy bill. According to the Washington Post, “If Barton gets his way and succeeds in passing this year’s energy bill, there is little doubt that the oil and gas, coal, and nuclear industries will have much to celebrate… Barton and President Bush… have dipped heavily into the same rich pool of campaign contributions from corporate and trade associations, according to a review of campaign finance and lobbying records. Since 1997, oil, gas, electricity, nuclear, coal and chemical companies have contributed $1.84 million to Barton, more than to any other House member.” [Washington Post, 4/14/05]