The original post: /r/explainlikeimfive by /u/TheRealCodeGD on 2024-04-30 20:59:28.

Let’s say that Queen Elizabeth II of England were to marry King Juan Carlos I of Spain (hypothetical). What would happen to their realms if these two sovereigns were to marry. What about their titles? Would their kids be in line to the Spanish throne, British throne, or both?