Washington Revised Code Title 11. Probate and Trust Law § 11.114.170. Liability to third persons

(a) A contract entered into by a custodian acting in a custodial capacity;

(b) An obligation arising from the ownership or control of custodial property;

(c) A tort committed during the custodianship, may be asserted against the custodial property by proceeding against the custodian in the custodial capacity, whether or not the custodian or the minor is personally liable therefor; or

(d) A noncontractual obligation, including obligations in tort, is collectible from the custodial property only if:

If the obligation is within (d)(i) or (ii) or [of] this subsection, collection may be had of the full amount of damage proved. If the obligation is within (d)(iii) of this subsection, collection may be had only to the extent of the increase in the value of the trust property.

(a) On a contract properly entered into in the custodial capacity unless the custodian fails to reveal that capacity. The addition of the words “custodian” or “as custodian” after the signature of a custodian is adequate revelation of this capacity; or

(b) For an obligation arising from control of custodial property or for a tort committed during the custodianship unless the custodial property is not liable for the obligation under *(b) of this subsection and unless the custodian is personally at fault.