He sounds depressed. It's unusual for a lab not to eat. Will he eat from your hand? If you sit outside with him & Jazzy, can you start feeding him titbits? Sitting with him and talking with him gently while stroking him may help. Does he wag his tail if you do that?
Does he look interested in food if Jazzy is eating? Most labs will focus on food when a human is eating, especially a child.
If he's not in pain/sick, it sounds like the only thing that will help is going home to Mum and his packmates. Will your SIL be away long? Has he been left alone before?
Try some warm milk to help him drink. Or some gravy. If he drinks it, add some dry food or mince to the mix.
I reckon if he continues to not eat, try hand feeding him some chicken. Most dogs are tempted by this. He is definately experiencing separation anxiety. Goodluck
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