St. Lawrence Seaway definition, a series of channels, locks, and canals between Montreal and the mouth of Lake Ontario, a distance of 182 miles (293 km), enabling most deep-draft vessels to travel from the Atlantic Ocean, up the St. Lawrence River, to all the Great Lakes ports: developed jointly by the U.S. and Canada. See more.
A uniform transfer to minors account, or UTMA, is a way that grandparents can put money away for their grandchildren. Sometimes called custodial accounts, UTMA accounts generally stay under the control of an adult custodian until the child reaches the age of majority.
Under no circumstance would I negotiate that check to anything other than an UTMA account. If the child is over 21, the custodian must turn the money over to them. The bank does not get involved. Have them deposit to an UTMA and then the custodian authorizes transfer to the child by writing a check.