If the son doesn't meet the what the trust was set up to do, the trust probably can be reformed by the court to instead change it to a regular trust with conditions that best match the intent of decedent. If the son is hoping to free up all the money now he's likely to be disappointed, but that will depend on exactly how the will (and trust document if it is separate from the will) is written. In order to best cover yourself as the PR I suggest you consult a Colorado attorney whose practice is mainly wills, estates, trusts, and probate. The attorney then can tell you what options there are that will meet your fiduciary duties given how the will/trust is written, what the estate assets are, and what, if any, other beneficiaries there are.