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Social security benefits paid to your spouse - reported on SSA-1099 under her name and her SSN - is her income - and included into her tax return.
You should not report these payments on your tax return because these are not your payments.
Social security benefits paid to children - reported on SSA-1099 under child's name and child's SSN - is income of that child - neither you nor your spouse report these payments on your tax return.
If child's only income - these social security benefits - they are not taxable and the child is not required to file his/her tax return.
Let me know if you need any help.