You'll enjoy a natural, intimate familiarity with each other that enables you, especially, to intuit your lover's deepest needs for security and emotional support. Even if there are needs that you've always had trouble putting into words, this aspect between you makes words unnecessary to a large degree -- you just have a feeling about each other, and a romantic urge to act on it. And most times, you find that you were right!
You love to spend time together talking about your families and your pasts, and this helps you to develop a picture of your lover -- of what kind of upbringing they had, of what experiences led to the kind of person they've become today. You could even take such an interest in their past that you help your lover do a genealogical search or create a family tree. This kind of project would be really fun to do together, and can bring you closer as a couple. This aspect also opens the paths of communication between you, helping to ensure that any disagreements that might come up are solved with compassion and understanding. Needless to say, if your relationship is long-term and intimate, this aspect greatly supports that energy and bond.