Also, you do realise that you can set up a trust for your son
that will be tax-free right? That's an easy way to get the missus
off your back; take out policies/long term investments (e.g.
consistent buy-ins) that pay out for your retirement. That way, you
don't have to be overtly paranoid and worried because the risk
profile is usually very low, and you get insurance for yourself,
your wife and your kids. If your wife cannot appreciate the
stability in your decision, then you ....
good luck.
EDIT: Since you have so much liquid cash, just pass an amount to
your partner, let her go play forex or do web-based
speculation:
2-fold:
1) She realises that speculation is gambling.
2) She will find something else to do besides bothering you.
BTW, with so much cash, I'm guessing you're with some premium
divisions of certain banks (or have a p.banker) .. how come your
wife still bothers you? Don't you bring her to see your
relationship manager ... those guys shd be able to easily help you
get her to see straight.