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?