alternatehistory.com

So, I'm on a bit of a Spanish kick at the moment, and I've begun wondering, with his second wife, Felipe IV had three sons:

Felipe Prospero

Ferdinand Thomas

and of course the infamous Carlos II

What I am wondering is, if say Felipe or Ferdinand had survived and were health and able to have children, what might the consequences have been? Especially if Carlos is born as he was otl?
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