I want to put in medical expenses for one of my children but TurboTax doesn't allow me to select dependants. Only my Wife and I.
Please see the following FAQ for instructions on how to claim medical expenses for your dependant who is over the age of 18.
https://turbotax.community.intuit.ca/questions/1189949-can-i-claim-medical-expenses-that-i-paid-for-...