Yeah Michelle's real son Alex came to stay with her for a bit and he was a bit of a psycho- I remember he locked himself in the pub once.
The Michelle/Alex scenes were really creepy she used to take him out for dinner and stuff but it was like they were on a date.
Ryan also went to stay with his real dad. After the story had ended Ryan used to make reference to keeping in touch with his real dad but the writers now appear to have forgotten this.
I think with this new Ryan they want to forget everything that has happened before and reimagine the character, they are not just ignoring the babyswap fiasco, they have also given him a personality transplant compared to the previous Ryan.