Re: Taxes on childrens benefits.
Yes, I would check with a tax professional. The IRS distinguishes a difference between "earned" income and "unearned" income. "Earned" income is that from a job that one actually earns. Conversely, "unearned" income is income from investments, capital gains, disability income, and etc.
The threshold for paying taxes is lower on unearned income vs earned income. A tax attorney will have the exact cutoffs.