Hello. I filed my son's 2019 taxes assuming I could claim him as a dependent on mine, so his were filed as "someone else can claim me as a dependent". He was a full time college student through Dec 2019. When I began to do my taxes I realized I could not claim him (he turned 24 on Dec 31, 2019 and earned $8,000 in 2019). Do I need to amend his taxes? He received a full federal refund of all the taxes he paid throughout 2019. The only thing I can see this affecting would be his stimulus check. Thanks for your help.