"My grandfather takes milk from Julia."
Translation:मेरे दादा जूलिया से दूध लेते हैं।
What everyone else says is correct, it's for respect. Check out the "Formality and Respect" section here: https://www.duolingo.com/skill/hi/Family/tips-and-notes
This is one of those sentences where context and how it is phrased is very important. Personally, I would take this to mean something like: Julia is one of many distributors of milk and dadaji buys milk from her. (In this case, I am considering Julia to be a milkperson (would it be offensive to put "milkman" as that is the traditional name of the ptofession?)
I had the same question but others have dealt with this, this is the response from above: "What everyone else says is correct, it's for respect. Check out the "Formality and Respect" section here: https://www.duolingo.com/skill/hi/Family/tips-and-notes"