@ mzmudallal
Who got the IND-544 rejection---your return or the son's return?
An IND-544 rejection means someone has already claimed the filer as a dependent, and a dependent cannot claim a dependent. If it's your return that rejected with IND-544, that would mean someone has claimed you as a dependent.
FAQ: How do I fix efile rejection IND-544?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/rejected-tax-return/fix-e-file-reject-ind-544/L5awls04u_US_en_US