Yes, this is the reason why your return is being rejected.
In order to fix the problem, two things must occur.
1. Your daughter-in-law must file an amended income tax return (see the FAQ below for instructions) to check the box that someone can claim her spouse as a dependent.
2. You must, unfortunately, file your income tax return by mail to include your son as a dependent.
https://ttlc.intuit.com/replies/3288565
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