If you complete your end of the bargain, keep Mr and Mrs blah happy and preferably married to each other, the shopping makes home intact and most importantly catering is spot on... Life is good.
Could be very awkward concealing trips, I reckon you are immediately in a lose lose situation with that, and extremely compromised. Thank Budha I've never been in that position.
My position is where the cash is coming from isn't your problem in terms of morals anyway. The accountants will have to live with the consequences of solid audit and public scrutiny. Perhaps it's not an employees' position to question the financial management of a company? I don't know!!
I haven't met many partners of the owner that knew the business well enough to be able to believe their 'opinion' of where the cash comes from. I reckon they just don't know most the time.
As for your investments and pensions etc, perhaps too many eggs in the basket?