You may be able to still claim him. One requirement is that you need to furnish over 1/2 of his support. If he used the inheritance to support himself, then he may not qualify, depending on how much money he spent on his own support. The money he inherited would not be taxable, so it wouldn't count towards the income limit of $5,050. Also, he would have had to live with you for the full year. You can learn more from this article from Intuit.