Oh, fo fuck's sake! If you've brought up a 12 year old who isn't capable of looking after a 12 month old awake never mind asleep then you've got bigger problems than your dh leaving them alone while he went for a run!
My DCs of 10 and 11 are perfectly capable of looking after a small child. As I type this, they are looking after their 4 year old brother, in the other room with the door shut. I am completely confident that they will try their utmost to keep him safe from any danger.
The point is, HOWEVER, that should he, say, fail to listen to their warnings and jump off the sofa and crack his head on the floor:
- would they know what to do?
- would they be able to comfort him (Mummy's boy) ?
- would they know the warning signs of concussion?
- would they be able to make a decision on whether to call an ambulance or not?
- would they be able to speak coherently to the 999 operator and answer their questions without panicking?
In the case of my older DCs, my answer to all the above questions would be, oh um yes, I think so, probably, maybe, I hope so, um yes.
BUT the most important question is
- would it be fair to put them in that position?
And my answer is a big fat NO
Which is why I am quite happy for my DCs to look after younger children, so long as, if there is a problem, I am available IMMEDIATELY. And that means not out jogging.