Yes, if your child is a disabled adult, he/she is a qualifying child. The child must have a valid Social Security number and:
- Be your child (including legally adopted), stepchild, eligible foster child, sibling, half-sibling, step-sibling, or a descendant of any of them (for example, your grandchild or niece); and
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Be permanently and totally disabled OR under the age of 19 as of December 31, 2017 (under 24 if a full-time student) and younger than you (or your spouse, if filing jointly); and
- Have lived with you (or your spouse, if filing jointly) for more than half the year; and
- Not file jointly with their spouse unless they weren't required to file but did so anyway to claim a tax refund.
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