My favourite, most tame, one-legged Daddy robin has been missing for about 5 days now.. I suspect most likely eaten by a predator or killed in a territorial fight ( I am very sad about this indeed

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Mummy robin's eggs have now hatched, perhaps today or the day before.
Is she going to cope with raising these babies on her own? Can I put any special kinds of food out to help her? Will she continue to look after them as fledglings or just leave them to fend for themselves to find another mate?
Grateful if questions are answered, to put my mind at rest.