See this TurboTax support FAQ for amending a tax return -
CURRENT YEAR
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-curr...
When he amends
Go to MY INFO. Click your name. Go through the screens for the question that asks if someone else can claim you as a dependent. Say YES.
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