Ah yes, I can't think of anything more wholesome than the family plotting to murder prospective marriage partners.
With all those requirements the guys laid out, Konrad's got a lot of work ahead of him or else Leslie will be staying single for the rest of her life.
And how could you do that, Duchess? How could you lie to Saraine?
@mahtan @Arkos
If we look at the aesthetics of the setting (the clothing and architecture), it's a bit of a mix of different time periods, but it's leans far more to a time around the 1800s than the Middle Ages. Regardless, we also don't have a detailed idea of how these people view marriageable age, other than the Earl's son willing to wait for Leslie's debut. Her debut being at 18, which is actually more in line with many modern ages of consent.
It's not that strange if we consider the differences of this world's history compared to ours. Also, it was just Ruenti who was upset about the age gap between Leslie and the Earl's son, and I would say that it feels pretty in-character for him. As someone who's studied and read a lot of literature, it's not strange for him to have more "modern" views on things compared to most other people.
But all that is secondary to how protective they are of Leslie. I would even say that the guys were just using whatever excuse they can think of to find fault in anyone interested in marrying her. But beyond even that, it's literally part of silly joke of overprotective family members.