Does a divorce issued under duress and extreme pressure take effect, and what is the ruling on someone who uttered it three times in a single sitting?

It is not the right of the husband's parents or anyone else to order him to divorce his wife without a valid Shar'i reason. If they do so, they are unjust. The act of writing or uttering divorce does not take effect unless there is intent. If you did not intend to divorce your wife, she is still under your marital bond.