
nah man I don't want Luka to marry princess charlotte bro they share too many genes. Even luka himself is inbred because his mom and dad were both related to the royal family. The amount of inbreeding and genetic fuckups that would carry on if he marries her later on scares me

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And take this with a grain of salt since I read this on the comments here long time ago and haven't verified it myself, don't remember where the original commenter go the information from:
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Spoiler ahead:
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Luka isn't actually related to the royal family, he's father isn't Jonas! So he could totally marry Charlotte without any inbreeding, it's their mental age gap which is a cause for concern as Luka tried to point out XD

nah I just read the spoilers about the ending and he, in fact, was Jonas's son and had royal blood in him, that was the reason he was able to turn back time in the first place by using the goblet that has been passed down in the winterwald family. He was actually not a winterwald meaning Jonas wasn't the duke's son. The princess slept around a lot and got pregnant by a random person and thus Jonas was conceived

Just an FYI; according to biology studies, marrying your 4th or 5th cousin is actually considered biologically ideal. Being too genetically close can cause inbreeding but being too genetically far can cause genetic incompatibility.
People also have miscarriages from genetic incompatibility (kind of like when you force two diff species to crossbreed).

Damnnnnnn. A child raised in a super strict environment tend to be wild and release that restricted energy in adulthood.
If that is so, then I think the duke's first love was the current duchess thats why he did not sleep with the princes. Then Rudiger is the true heir of winterwald and their child and Judith's

Hard to believe, on the long run even with just 5th cousins there would undeniably be too much impoverishment in the gene pool, a bottle neck effect if you will.
I don't doubt that genetic incompatibility can cause miscarriages easier, however I believe that there are so many other factors that affect the change of miscarriage far more. But yeah, humans are all too similar to one another to be compared to different species, that does seem racist.

Perhaps my wording/example is a bit poor. Reproductive compatibility is different, as there is nothing that prevents humans breeding with other humans (people are marrying strangers all the time of course!), but genetic incompatibility can exist within species. That doesn't mean it is impossible to have offsprings. Miscarriages is just one example. Genetic incompatibility can also mean that the offsprings may end up nonviable, prone to disease, or genetically defective in some way. One example is immunological compatibility. There are a few in-vitro studies to support this.
As for first hand anecdotes, I have a cousin who went through this with her husband and I won't get into the nitty gritty of what happened, but after many medical considerations, it was found that they would have trouble having healthy offsprings together; but there was nothing wrong with them physically as individuals.
You don't gotta take my word for it, it's better to do your own research.

Also, having a baby with a third or fourth cousin is already considered a distant relationship in terms of genetic relatedness. The risk of genetic disorders or birth defects of doing so is not significantly higher than the general population. If you're worried about gene pool, your 5th cousin is practically similar to a stranger. Your 5th cousin only shares a tiny fractal percentage of ancestral DNA. If that were a problem, smaller countries that don't marry outside would already be in dire straights.

Yeah, no. I did study pre-med bio which covered genetics and molecular distribution of gene inheritance and in no way or form is genetic incompatibilty a human thing (when we're talking about strangers). The one and only exception to this is when both the parents are carrying a reccesive gene (which is usually the case when both the parents are related) coincidently and then they produce an offspring and now the reccesive gene is being presented when it has been dormant in many previous generations.
Also the thing about Luka is that he is not a proper 5th cousin to the princess. His mother is also related to the main family line. That means he's closer to a 2nd or 3rd cousin not a 5th cousin. And even if he were her 5th cousin the chances of them presenting an offspring with defects are higher than if he were to reproduce with someone not related to him
Istgg it's always the cutesy rainbow artstyle webtoons which has the most mentally unstable characters