As a mother, my opinion is that it is definitely 
not maternal.  I wouldn't leave my kids for such a long period, but if I was ever in that situation, then someone like Pete wouldn't be any kind of substitute.  
The fact that she finds him attractive strikes off any kind of "maternal" connection.  I find him attractive, and therefore wouldn't feel maternal towards him at all.  You can't have it both ways.  
In that situation, I would probably be more likely to feel maternal towards Glyn.  1. Because of his age.  2. Because of his naivety.  3. Because I don't feel the slightest bit attracted to him... and 4. Because he is a bit useless at stuff around the house, and could use practical help.
I just don't buy this maternal thing with Lea & Pete.  She would shag him in a heartbeat if he was up for it.  
