The full language hasn't actually been "released" or made available to the public; we see a small amount of the language, with simple words such as "open", spoken in the books and movies. This is as far as we can go with knowing the official language. Other than that all we know is that the language is made of a variety of hisses, however if you want to be able to speak it correctly there is no such way to find out what to say at the present time.
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No, because Harry could only speak Parseltongue because of his connection with Voldemort, because he was a horcrux. Therefore, when both the horcrux in Harry and Voldemort were destroyed, Harry could not speak Parseltongue anymore, and none of his children inherited it.
He can't actually speak parseltongue. The bit of Voldemort's soul that attached to him when he originally tried to kill him gives Harry a few skills that Voldemort has such as speaking parseltongue. When that section of Voldemort's soul was removed from Harry he could no longer understand or speak it.
In the DS version, you hiss into the micro-phone when a tiny purple symbol with a green snake on screen
No. If you're wondering how she opened the Chamber of Secrets, that was Tom Riddle speaking Parseltongue through her.
There is no Ron Grigsby but there is a Ron Weasley
Arthur Weasley
Arthur Weasley.
Ron is short for Ronald, which is Ronald Weasley's real name, as shown in The Will of Albus Dumbledore in Harry Potter and the Deathly Hallows and said many times by Hermione Granger in the films.
If you are referring to Ron Weasley, then no he doesn't.