Regarding King Felipe's interest being "null", I would then ask doesn't he have to take some interest in the future when his own younger daughter marries, and by custom he gives her a ducal title? So at least...family obligations continue?
Good question. Further below, Manuel said daughters of Spanish monarchs would always remain known as Infanta anyway, and that the granted titles were mostly for the benefit of the spouse. Felipe may reflect with caution on his own brothers-in-law and employ a fresh approach when the Infantas marry.
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