2 people will share a birthday?

Why is Ishaan coming with so many gifts? And the house is decorated. It's either Mauli's birthday or her daughter's I think. And I feel like Mauli's birthday might be the same as KuNan's daughter if she exists (so far I haven't seen any reliable source say she exists). And if it is Mauli's daughter's birthday it might be the same as Nandini's. The show started with Nandini's birthday and it was a significant day for Mauli.