Now that p has established herself as Yashoda, Sai can tell Vinu she is Devaki who was pinning for her baby. While Yashoda got to spend time with Krishna while living her life normally, Devaki not only had to spend it in jail in miserable condition away from home for no fault of hers, she missed her baby.
Krishna took Devaki out of misery, returned her life back & went on to live with her. That doesn’t minimize his love & gratitude for Yashoda. It just that Devaki was his real mother & that whom he belonged with.
Vinu too should be with Sai & appreciate what P did for him till now & meet up with her as per Sai
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