How to find the memory utilized by a parent process in Linux?

If there is 1 main process and 3 child processes for that, I want to know how much memory is being used in total by the 1 parent and 3 child processes. I know only PPID.

We are using Redhat AS 2.1. In our application, one Java process is creating 100s of threads. I want to know the total amount of memory is being used by that process.

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