If the mother is your dependent, no, she cannot claim the stimulus.
If the toddler is also your dependent qualifying child, you should get a stimulus payment for the child.
If you mean the mother of the 17 year old, no, not if the 17 year old and the toddler are your dependents.
The 17 year old dependent would not qualify for the first or second payments, but should qualify for the third stimulus.
The toddler would be eligible for the first, second and third payments.
Any portion of the stimulus which should have been received but wasn't, should have been included as the "Recovery Rebate Credit" on 1040 line 30 on your return if you claim them as your qualifying child dependents on your return.
For the first and second stimulus payments:
A qualifying child is a child who meets the following conditions:
- Relationship to the individual who’s eligible for the payment: The child is your son, daughter, stepchild, eligible foster child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or a descendant of any of them (for example, grandchild, niece, or nephew).
- Child's age: The child was under age 17 on December 31, 2019.
- Dependent of the individual who's eligible for the payment: The child was claimed as your dependent on your 2019 tax return or in the Non-Filers: Enter Payment Info Here tool.
- Child's citizenship: The child’s a U.S. citizen, U.S. national, or U.S. resident alien.
- Child's residency: The child lived with you for more than half of 2019.
- Support for child: The child didn’t provide over half of their own support for 2019.
- Child's tax return: The child doesn’t file a joint return for the year (or files it only to claim a refund of withheld income tax or estimated tax paid).
The payment will include $600 for each qualifying child listed on your 2019 tax return with a valid SSN or ATIN.
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