PlPg/SQL

Hi!

How can i return one more row form a pgpl/sql function?

CREATE OR REPLACE FUNCTION GetRows(INTEGER, INTEGER, INTEGER) RETURNS
TEXT AS $$
	DECLARE
		Rows table_name%ROWTYPE;
	BEGIN
		SELECT * INTO Rows FROM table1_name WHERE id = $1;
		-- Return (1, 'Smis', 'smis@gmail.com')
		SELECT * INTO Rows FROM table2_name WHERE id = $2;
		-- Return (2, 'Ashle', 'Ashle@gmail.com')
		SELECT * INTO Rows FROM table3_name WHERE id = $3;
		-- Return (1, 'Galaxy University', 'g-uni@gmail.com')

		RETURN Rows;
	END;
$$ LANGUAGE 'plpgsql';

SELECT * FROM GetRows(1,2,3);

I want return for all 3 row in one table? How can i do that?