hey, thanks, everyone. It's cool to have your thoughts on this.
Yes, it is very tricky to do astrological research, and I used to be quite sure that it's actually impossible, but then I decided I would give it an honest try anyway. Yes, each chart is unique and aspects to the ascendant and to its ruler etc change a lot, but I'd like to see whether mutable ascendants show some basic trends anyway.
Thanks, Flapjacks, noted, I will have to sit a bit more on how to formulate the questions to reflect better what exactly I want to know.
I should explain more. When I ask whether the parents were very different from each other, I mean whether the person was put in a position where the emphasis was on their adjustment to the parents and mediating between them, or mediating between the family (value system) and the world, etc. A situation of more-or-less constant "negotiation" for the child, where, from the very start, they perceive the world as a place where everything is "dual" and/or multiple and/or in flux. No fixed rules to follow, the child has to find out for themselves which rules apply at the moment and has to become fluent at "switching". something like that.
By major change I meant the kind of stuff I put in brackets, those that are quite independent from the birth of the baby, not the usual sleepless nights etc. There are lots of people I know who were quite set and ready by the time they had kids, they lived together for years, they were settled in their house, in their jobs, etc, so the baby was about the only change in their life. A big change for sure, but still, their life went on in quite a predictable way, mostly in sync with their friends, neighbours, etc.
For example, I have a fixed ascendant, and sure, my parents were different in personality (my mother is very authoritarian, while my father was a big kid), but for an outer observer, they were quite homogenous: the same age, the same social status, about the same background. No multiple sets of rules for me, we all did what my mother said, or else, lol. Sure, having a child brought changes, but on the outside, my parents' life went on along the same tracks as most families in the neighbourhood. We did what everybody else did, when everybody else was doing it. My parents even bought their casette player when everybody was buying one, and so on. Same town, same factory jobs, same circumstances.