The way I have been doing it is linking the two through key words. In my mind, I think about it, as I'm writing cousin articles. I wrote a hub here about things to consider before starting a baby's nursery. I linked it to two articles on my site, one for baby sleep habits, the other for children's beds, which in some ways are both related to the topic. I didn't duplicate content, the three articles sort of compliment one another. On the right side of my site, I have a widget that references the last four hubs I've written, so I have a link back.