How To Build Relations To Display Columns Of 4 Tables In Cgridview Of Admin.php

I'm a newbie. Now I have a requirement where I need to build the relations between more than 3 tables.
I have 4 tables namely, Message, Flat, Person, Mapping tables.
Now, below tables have the following fields:

Message:
`Id` int(11) NOT NULL AUTO_INCREMENT,
`Mapid` int(11) DEFAULT NULL,
PRIMARY KEY (`Id`),
KEY `FK41715B218022FC0` (`MapId`)

Mapping
`Id` int(11) NOT NULL AUTO_INCREMENT,
`FlatId` int(11) DEFAULT NULL,
PRIMARY KEY (`Id`),
KEY `FKE2B3C68A24F94F50` (`FlatId`),

Flat
`Id` int(11) NOT NULL AUTO_INCREMENT,
`PersonId` int(11) DEFAULT NULL,
PRIMARY KEY (`Id`),
KEY `FK2FFF79122B94A6` (`PersonId`),

Person
`Id` int(11) NOT NULL AUTO_INCREMENT,
`Name` varchar(255) DEFAULT NULL,
`FlatId` int(11) DEFAULT NULL,
`Phone` varchar(255) DEFAULT NULL,
PRIMARY KEY (`Id`),
KEY `FKC4E39B55AF5432C` (`FlatId`),


Now, I have to build relations in such a way that in the Cgridview(admin.php) of Message, i should display PersonId of flat table and Name and Phone of Person table along with the columns of Message table.