No, this is not about marriage. This is about half-elves (and half-orcs, and other halves).
Half-elves are given standard stat modifiers in RM2 and RMSS/FRP. I've not seen any in RMU, but it might only be a matter of time. They are presented as a distinct race.
In Shadow World, there are several races of half-elves (with different racial profiles). They are obviously distinct races as well.
None of those seem to represent *half-elves* - people born of a human and an elf parents.
How do you handle half-elves from a technical point of view ?
Do you go the easy way (average modifiers, and that's what you get), with the image being that a half-elf is half a human and half an elf (add both, a pinch of salt, shake, bake for one hour) ?
Do you go the yes/no way (you might be a hybrid, but for everything that counts, you are either human or elf - pick a race and roll with it) ?
Do you go all random (for each attribute, roll : 1-50 means you inherit from your father's side, 51-100 means you inherit from your mother's side. Roll those bones and find out) ?
How do you handle it, overall ?
[I'm assuming the setting is *not* Middle Earth].