If Neptune is in the 7th, you belong with Neptunians – creative, artistic or spiritual people. If Pluto is in the 7th, you belong with Plutonians – for example, deeply psychological, emotionally honest people. Similarly, with Saturn in 7th we think of serious, mature or ambitious people as your “tribe.” With Uranus there, perhaps you feel at home with the people that don’t mind breaking the rules sometimes.
The use of the word “tribe” allows us to think beyond marriages and partnerships when looking at the 7th house – after all, the planet in this house would also color the quality of the “public” that we express ourselves to – which is to say, the tribe that we belong to.
It makes sense to me personally to think this way – I think I will ask my tribe of astrologers for their opinions. Your thoughts and comments are welcome, of course…
Update: Someone commented below about the 11th house being associated with the word “tribe”, and this is very proper – I think both houses carry similar meanings in the sense of the “people that you belong to”, but 7th house feels closer than the 11th…I’ll see if I can find some distinction between the two houses.
One possible visualization is, if 11th house is the entire group (for example, a large conference), then the 7th house “tribe” would be the small sub-group within that group that you feel really good in. In looking at the charts of those people in your sub-group, you may notice that a lot of your 7th house is reflected in their horoscopes. At least this has been my experience – so we’re talking about a different level of “belonging.”
Another house that I’ve thought in connection to “tribe” is the 4th house, since that is the family tribe, which is the most basic group you can belong to. All of them make sense.