How to display reference group filed in custom form

Scenario: I have 3 custom tables A, B and C. 

Table B is using RecId relation form table A for reference group to show the record of table A. 

Relation: TableB.RecRef==TableA.RecID;

Table C has lookup field from table B. 

Relation: TableC.VehicleId==TableB.VehicleID;

There are forms A, B and C respectively for Table A, B and C. 

I want to display the record the record from Table B to table C using display method. 
Since there is RefRecId in Table B which is used for reference group from Table  A. 
So ultimately i have to display the record from table A and Table B using only relation from Table B in Table C. 
Using Table Display method 
Display RefRec refRec()

{

 return Table B :: find (this.VehicleId).RecRef;

}

it only show recId of records from table A, but i need to display each field on same RecId.

Please help me out.. !!!