Updates from an external blog displayed in sidebar

I’m using wordpress for a web site for a friend. She also has two other blogs hosted externally from the above web site. She would like to display updates from one or both of these other blogs in the sidebar of the web site. I’m new to wordpress. Can someone point me in the right direction to find out how to do this (widget? code?).

Many thanks in advance. I’m gradually getting more familiar with wordpress but the demands of getting content up are outstripping my learning speed.