As we prayed for and saw Khushi broke her fast with Arnav and they are meant to be together no matter what other forces are trying to do. Then the best thing today was the fact that NK broke his fast and saw Sheetal's face - now that tells us that finally NK gets a girl and that girl is none other than Sheetal
Now coming to the DNA - I am not that good with Hindi but I think the test said that they are related. Being related can mean that they are just blood related and doesnt necessarily have to be father and son relationship
As for Sheetal using Khushi's taal well that just pretty much shows that Sheetal will try and take Arnav secretly from Khushi and has already planted the seed in Khushi's mind. But as everyone usually does Sheetal has underestimated Arnav and Khushi's love. Khushi will do anything in her power to make sure that Aarav and Arnav will have a father - son bond but under no circumstances will she let go of Arnav. Khushi's dreams have also given us this clue - she is fine by Aarav but will fight tooth and nail for Arnav
To me this whole track seems to be Sheetal's plan not to trap Khushi and gain Arnav but to make sure that Khushi is the one to find out the real dad. I think the father of Aarav is someone the Raizada family doesnt like so Sheetal is apprehensive is telling them. She is using Khushi to gain the acceptance and than will tell the real truth. There is more to this that what the eye see and the hear hears and it is time to start investigating
Another thing - dont be scared of the dialogue Arnav said that what if he is not there in the future. It is just common sense to make sure your loved ones are taken care and doesnt mean that something is going to happen to Arnav. The only thing I can see from this is that Arnav himself has given Khushi the weapon to leave him. If Khushi decides to leave him to be with Aarav and Sheetal than she will have something to fall back to and can support herself and the Gupta family. Now I dont think at all she would leave him but just in case she does this Dabba business can come into play
Last but not least - I need to know the name of the courier company that delivered the DNA results. It is late at night and they still deliver? Maybe I could use their business for the company I work for