Efficiently querying db

I have a db that looks something like this .

{ message : xyz
parent : 23
id : 25
}
or
{ message : abc
parent : None
id : 25
}

{ message : cde
parent : 28
id : 32
}

{ message : lbq
parent : 23
id : 35
}

I want to make seperate the lists such that messages in same thread(
The parent message and its child messages } come together . What is
the best way to query the db or a efficient algorithm to do this.

--
A-M-I-T S|S

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