Yes, it matters where they live. If the kids, who are over 18 are fulltime students, they need to live with your for MORE than half of the year in order for you to claim them for any credits or to use the Head of Household status. With the new tax laws, the only credit you would get for an 18-year-old would be the $500 NonRefundable Other Dependent Credit if they did not provide more than half of their own support.
If they are NOT fulltime students, then you would only be able to claim them if they earned less than $4,150 and you would have had to provide more than half of their support for the year in order to get the $500 NonRefundable Other Dependent Credit.
In either case, they would need to have lived with you for more than 1/2 the year for you to claim head of household.
https://turbotax.intuit.com/tax-tips/family/guide-to-filing-taxes-as-head-of-household/L4Nx6DYu9
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