Even in a case where the parents do qualify to claim a recently married child, it's still the newlywed's decision whether to let them (it's not automatic). The smart thing to do is for both couples to prepare their taxes both ways and see how the family comes out best overall, before filing. For a detailed discussion, see;
https://ttlc.intuit.com/community/taxes/discussion/can-i-claim-my-daughter-who-got-married-on-decemb...
