A Wow Of A Party! - It was really meant to be a quiet second birthday Susan Mills, daughter of boxer Freddie. Then along to home at Dulwich, London, came comedian Norman Wisdom fifteen-month-old son Nicholas. And the party really with the two dads doing all the entertaining. They played tunes at the piano, stood on their heat a sort of song-and-dance act. But the biggest hit of the day was the "train ride Dads lie on the hold the children up high - and ***** like trains. ***** agreed: It's a wow