Sparrow taking over a nest that has young robins in

A Robin built a nest under my eaves through this spring.
I watched her sit on them and apparently they hatched as I found blue egg shell in the garden beneath. 
However, today…a male sparrow has taken over the nest and appears to be picking at something in the next or taking food out of the baby birds’ mouths. 
I can’t tell what’s going on. 
He sits on the edge of the next chirping away.  He flies to a fro the nest. 

What do you make of this?
Also…I haven’t seen the Robin come to her next in a couple of days.

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I received the above question the other day.  What do you make of this?

 Here are two other times when sparrows seem to have thrown other birds out of nests. Click on these links if you would like to read about it.

 SPARROW EVICTING A MARTIN

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SPARROWS PLOTTING

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 Here is my reply to the comment :

Thank you for sending this.  I will do an article about it.  I have a reader called Jennie who has told me about sparrows sabotaging a nesting box that had wrens in it!  It is on birdtable news on 29th April.
There is also a story from 1912(!) about sparrows evicting a martin from it’s nest.  That is on my blog dated 31 March 2009. 
I have never heard of such a think until I started birdtablenews.  From what you saw and what Jeannie and the 1912 Gent saw it does seemthat sparrows can get nasty sometimes.  Maybe it is when food is scarce – I don’t know, but will see if I can find out more.
Birds do attack other birds.  Sparrowhawks eat sparrows and other birds, maybe this is a continuation.  I do not know I am only jumping to this conclusion because of my other notes.  Trisha from Bird Table News

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Please contact me if you can think of a reason for the above, or if you have have heard of robins being aggressive with other bird’s nests – or robins being aggressive at all.  I’d love to hear. Trisha

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