Every call from Hyderabad ends with 'so, when is the second one?' Now our 3 year old asks too

My mother-in-law, my aunts, my partner's cousins, the neighbour aunty who drops in on my mother. It isn't even rude any more. It's just how the call ends, like 'okay, take care'. Last week our son picked it up. Ammamma asked him on video whether he wants a thammudu or a chelli, and he came to me very seriously and asked when we're getting one. As if it's on order. We haven't decided anything and we don't plan to discuss it with the whole family. What I'd like is one line I can say pleasantly that ends the conversation without starting a new one. And something simple for him, because he's three and he will ask again tomorrow 😊