Ryan is 23 but disabled we support him he is my grandson lived with us since 4

Yes, you can claim him as a qualifying child dependent, as long as he meets all the following conditions:

 - Relationship: The person must be your child, stepchild, foster child, adopted child, brother, sister, stepbrother, stepsister or a descendant of one of these (for example, grandchild)

 - Residence: The person must live in your home for more than half the year. If he or she is temporarily absent, that still counts as time living in your home. A temporary absence could be time spent at college or boarding school, or time away for medical care, military service, or juvenile detention. Different guidelines apply for children of divorced or separated parents.

 - Age: The person must be age 18 or under at the end of 2016, or a full-time student age 23 or under. If the person is disabled, there is no age limit.

 - Support: The person cannot provide more than half of his or her own support.

 - Nationality: The person must be a United States citizen; or a resident or national of the U.S., Canada or Mexico. An adopted child that is not a US citizen or resident of the US, Canada, or Mexico must live with you for the entire year.

 - Marital status: Generally, a dependent cannot file a joint tax return with a spouse. The only exception is when the dependent files a joint return only to get a return of taxes paid (no tax credits received) and, if separate returns filed, neither dependent nor spouse would have a tax liability.

In TurboTax, Personal Info, Add dependent, you will need to indicate, under Who do you support?, please select Another person, The person I support is my, select Grandchild