Ruth Madoff's conduct included "fraudulent conveyances, breaches of fiduciary duties, conversions, and other wrongdoings."
Those troublesome 65- and 66-year-olds, of course, raise not merely a fiduciary question, but a moral one.
So, no, I would not entrust my money to them, because it is clear that they do not feel any fiduciary responsibility to me.
1630s, from Latin fiduciarius "(holding) in trust," from fiducia "trust" from root of fidere "to trust" (see faith). In Roman law, fiducia was "a right transferred in trust;" paper currency sense (1878) is because its value depends on the trust of the public. As a noun, from 1630s.