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SQL-Server

how can get extreme right and extreme left child values in store procedure for 2nd,3rd
and above layers???

suppose A is Head

and B and C are Childs of A

now if B have there childs called D and E

And C have there childs called F and G

then for 2nd Layer A will consider D as his Left And G as his right so how can i get D and G values or count to increment A...

i have made the store procedure what changes shall i made in that..

here is my store procedure

ALTER PROCEDURE [dbo].[sp_PairMatch]
	(      
		  
		   @sponcorid varchar(50)= NULL,
		   @count_mem varchar(50)= NULL,
			@regCode varchar(50)=NULL	  
     )
AS
BEGIN

	
	
	--Pair Matching
SET @count_mem=0

WHILE(@sponcorid is not null)
	BEGIN
		SET @count_mem = (select Count(*) from Registration_Master where sponcorid=@sponcorid)
		IF(@count_mem=1)
		BEGIN
			return
		END
		
		IF(@count_mem = 2)
		BEGIN
			DECLARE @persent_Count int
			SET @persent_Count = (Select count_mem from Registration_Master where regCode=@sponcorid)
   			SET @persent_Count=@persent_Count+1
			UPDATE Registration_Master SET count_mem=@persent_Count where regCode=@sponcorid

			DECLARE @temp varchar(50)
			SET @temp=@sponcorid
			set @sponcorid = (SELECT sponcorid from Registration_Master WHERE regCode=@temp )
			
--			IF((@count_mem >=20) AND (@count_mem<40))
--			BEGIN
--				UPDATE Registration_Master SET @member_status='MANAGER' where sponcorid=@sponcorid   
--			END
		END

END

END

SELECT * FROM Registration_Master WHERE regCode=@regCode

{´[edit]code block added[/edit]