Separated At Birth!
I was just watching the film radio-flyer, in which Lorraine Bracco apparently plays the two boys' mother, Mary.
Until the credits, though, i was convinced that Mary was played by the British actress Imogen Stubbs.
There's no photo submitted on Stubb's profile page, and in fact the one on Bracco's doesn't really show what i'm talking about [partly because of the dark hair].
However, a Google image search reveals many examples illustrating their similar facial features.
Just thought you'd all like to know...