The story that I'm writing is set in an alternate, vaguely-medieval Europe. There are some differences, since in this world, magic has been a known and relatively steady influence on culture and politics since the late Roman Empire. But broadly, I'm trying to still preserve at least some of the actual cultures involved.
The two characters involved in one dispute are ~French and ~German, and the dispute touches on their attitudes toward marriage. My family (American Midwest) sees marriage as combining both families, but that's not universal. So my question is, if anyone has experience with French or German culture (or literally is French or German), what tend to be the general attitudes? (Especially the traditional attitudes, since the characters are the Crown Prince and Crown Princess of their respective countries.)
Do they have different attitudes? Are they similar or shared? Is the general view that the two families unite (and the in-laws are considered as much the new spouse's family as their own)? Is the view that one spouse (generally the wife) leaves her family to join her husband's (and his family may or may not consider her family to be part of theirs)? Did attitudes change over time? (The timeline and technology are different enough that I can't tie it to any specific year or century, but probably somewhere between the 14th and 18th centuries.) Did different social classes hold different attitudes? Did different areas have different attitudes?
If it wasn't obvious, I'm very curious about basically any information that even vaguely touches on this. Anyone with any answers, thank you in advance!