Why is only one of 2 children getting hte 2k tax credit? the other is 500 dependant decuction

I would guess due to their age.

To qualify for the Child Tax Credit, your child must fit all of these requirements: 

• Be under age 17 at the end of the tax year 
• Is your son, daughter, stepchild, foster child, adopted child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or a descendant of any of them (for example, a grandchild, niece, or nephew) 
• Has his or her own Social Security Number 
• Lived with you for more than half the year 
• Didn't support him/herself (i.e., didn't pay more than half their own expenses) 
• Is a U.S. citizen, U.S. national, or U.S. resident alien 
• Additionally, you must have tax liability for the credit to be applied to.  If you do not, you may qualify for the Additional Child Tax Credit. 

These links will provide more information: 

Child Tax Credit 

Additional Child Tax Credit 

Did they turn 17 in 2023?  Has to be UNDER 17 to get the Child Tax Credit.