Dependents are claimed in MY INFO.
IRS interview to help determine who can be claimed:
https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent
To claim a grandchild as your dependent
When you enter the child’s name in My Info, you will be asked “What’s your relationship to [child’s name]?”
Choose “another person”
a drop down menu will appear that lets you choose grandchild
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**