Roman Stlye Adoption continues?

In classical Roman times, adoption were pretty regular among the elites for various reasons. Wiki suggests the cost of children was a major factor. Later on for the Germanic tribes blood kin proved to be more important as they constituted a loyal group to increase security.

Is there a way to make Roman style adoption become an accepted practice among the Germanic tribes if Rome still begins to decline in the Third Century and eventually the west falls in whatever way so the Germanic tribes are politically dominant?
 
Well, the Maximilian tried to do that in Mexico with the Iturbide, but that plan went stillborn before it was implemented. And there's also the case of Bernadotte ending up becoming King of Sweeden.

But other than these rare examples, I have no idea how to make this more common. Perhaps having the offsprings of monarchs not exempt from doing duty in the infantry, resulting in more fatalities and forcing adoption to become a necessity.
 
Well, the Maximilian tried to do that in Mexico with the Iturbide, but that plan went stillborn before it was implemented. And there's also the case of Bernadotte ending up becoming King of Sweeden.

But other than these rare examples, I have no idea how to make this more common. Perhaps having the offsprings of monarchs not exempt from doing duty in the infantry, resulting in more fatalities and forcing adoption to become a necessity.
I'm going to have to read back on my Gies books on the evolution of the family.

Are there examples of early Germanic societies that used adoption to bind themselves in alliance? I'd hate to have to prevent the fall of Rome to pull this off but it's possible that only a more complex and larger society would go this way. For a long time having more sons was fine because there was so much land to reclaim (or claim in the first place) that it was easier to provide for them. So too the survival rate of kids was low enough it made sense to have as many as possible because a few of them would die.

So less land, and better medicine/sanitation to reduce child mortality might be important here.
 
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