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Hi all, just an update, and thanks Suzie, I hadn't seen your post. His Dad got a waterproof mattress protector and put it over the mattress and I also asked him to stop smoking in the house 48 hrs prior to him having him and air the place out, which he agreed to. Small insinuations as to whether it was from my house that the illness was coming from, until I forced home the issue that he was getting better when he was at mine and coming home with the cough/cold. All seems hunky dory now, although he has got a cold at the moment - I'm putting that down to nursery and kids being kids - if he comes back again like it then I shall have to have words. His Dad's not that bothered, says kids get ill all the time when they're at nursery etc, which I accept, but it's the timeline that bothers me...fine all week, goes to Dad's, back with a sniffle, runny nose, cough, gets worse - almost like his sinuses are emptying themslves, then by middle week he's fine again...back to Dad's, sniffle, runny nose...you get the idea. I really don't want to stop him going, but I have to face the fact that he's getting ill from being there. His Dad has just moved house, so let's hope that helps. Fingers xed.
Thanks peeps :)