Does Rob Donovan think he's Ryan Connor's dad?

Watching last night's Coronation Street (14/10/12), a thought in my mind came to the conclusion that it is possible that Rob Donovan thinks he is Ryan Connor's father. 

Let's not forget that Ryan is NOT Michelle's real son. Ryan was the baby Michelle picked up by mistake in the hospital. Alex is her real son. 
 
In a scene in the Rovers, where Rob is comforting Michelle, Ryan and Tracy enter and Ryan mentions that Michelle fell pregnant at 15. Ryan mentions his father, and there's a camera shot on Rob which got me thinking that he's his father. And considering Rob and Michelle's history, it is possible. Anyone else thought about it? Or am I thinking too much into it?

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