Hi there.. it's really interesting because that's a core feature that we are focusing on at Saleswhale (http://saleswhale.io/product-tour). When you click into a contact's dossier (sadly, I'm not able to upload screenshots here), it will show you all related contacts, interactions and other smart insights that we managed to surface.

We are currently still in beta though, but we would love to work closely with you and get your ideas and feedback how to make Saleswhale more useful for you.

I'm the technical co-founder at Saleswhale and you can drop me a line at [email protected] if you want to chat more.