Waterlilly, Although I'm very interested in this topic, I'm not sure how much I can help you.
I am *half adopted*- My mother married a man, not my father, after my birth.
I have mercury/cj neptune in my tenth house (mother)- I feel this describes the deceptions under which I was raised....My mother to this day wont tell me *for sure* who my father is! At the moment I have just found out I can apply for this information under the Adoption act...The name of my real father is likey to be on a document signed by the man my mother married when he purportedly adopted me. I believe Freedomlover has posted threads too on a similar topic.
My guess is that if you are looking at a chart from the adopted persons perspective, youd look at the tenth and fourth houses, expecting to see planets either there or conspicuously NOT there.
Now, in my case, house 4 is empty...It has pisces on the cusp, so I look to jupiter to rule my father...Hes on the cusp of the eighth, square to the mercury neptune which is in my house of *the mother*, so I can see that something is going on there.
If you are looking to see if a person would adopt a child I'd look at the seventh (other people) and go to the fifth from there- so I'd see adoption as primarily an 11 th house issue with 4th and tenth showing links to there.
No astrologer has ever identified specifically that I was partly adopted- but they have all identified the dishonesty of my mother and the absence of a father.
When it was finally revealed to my half siblings that I was their half sibling, my relationship with them seriously deteriorated...their choice- I guess it felt to them that they had been deceived too but projected this onto me rather than have to accept their mother was dishonest (they were still kids at the time)...In the last 2 years I have managed to salvage a relationship with my sister, who also has doubts as to who HER father was.
I always *knew* that the man I called *dad *was not my real father...The problem for me astrologically has been that the house that rules my father, the 4th has pisces there with the same degree as my mothers ascendant!.So as you can imagine,I've been very interested in all the discussions as to whether mother is ruled by 4th, or father....Maybe having my mothers asc there tells me my mother was my mother and also my father at some stage- maybe a clue to *adoptedness*...
In MY 11th I have saturn and venus,(not conjunct) but they only make positive aspects...However, both are in scorpio.This tells me there were secrets about saturnian matters in relation to organisations- which adoption agencies are.
Apparently for some time I may have been a state ward and in the next few months I will have that information.Then I'll be looking at my chart again, with a view to seeing where this is shown.The BEST thing about this is I will be able to confirm the accuracy of my birth time!
I will keep you posted and thanx for this interesting thread!
Cheers, Lillyjgc