No. Social security disability income does not fall in a category of income that can (or needs) to be reported as income of a dependent on your return. You do not need to report it on your tax return.

If your son has other income besides social security, he would have to (or a someone else would on his behalf) file a tax return to report the other income and include social security income.

See IRS Publication 929 for the tax filing rules for children and dependents by clicking here