I'll drop my 2 cents too and see what happens.
As it stands now, Royal Relations is a useless trait which only serves to fill the game with checks for it. It could either be replaced by Royal Blood (therefore allowing super breeding as Fatecheater described) or by simply giving separate Royal Blood traits to princesses which do not affect their children in any way (let's say a new Royalty trait which gives +1 charm to princesses and Royal Wife trait which gives all husbands some law). That would cut a couple of pages in traits no matter what. While loyalty drops to limit royal relations may be a solution to improve that trait, it might even prevent royal marriages later to avoid zero loyalty.. it's a fine solution, but certainly not a perfect one.
Actually, RollingWave already suggested the introduction of Faction_Blood traits which would allocate the same bonuses to every character in a faction, not just royal family members - for the latter, the Royal_Blood trait would provide the necessary Authority and Loyalty boost. As for Royal_Relation, this trait enables players to track the ancestry of a characters, which I believe is a good feature and should be kept.
I hardly ever see Loves_Father or Hates_Father in effect or making any difference.. quite pointless traits I believe.
They give Loyalty bonus or penalties, not the greatest traits in my opinion either, but I think they could remain untouched.
RulerOfSicily seems to be a trait that is meant only for Italian nations. Don't get me wrong, but is there a point in trait that gives (meagre) bonuses to owners of only one particular location? Since owning Iberia or other large clusters of lands gives you nothing... it should go, at least till many more locations start giving traits.
Agreed, this trait is completely useless - Rozanov has already removed it in his own mod, and I already indicated I'd follow suit.
FactionKiller giving dread is quite annoying. So, if you kill an enemy who is constantly attacking you and refuses to stop that is abominable? Or, let's say, a nation destroying their natural enemies, like French vs England? I believe this trait shouldn't influence dread/chivalry in any way.
Agreed again, actually, if you check out the Excel file in the first post you can see I already proposed its removal (to be merged with the VictorVirtue trait).
Cutting the middle level in fears/hates traits might be a good idea - not only I haven't ever seen the third level, but also separating hate into three parts looks way too detailed. Neutral > dislike > hate seems to be more reasonable to me as much as Neutral > Fears > Terrified.
Great idea, at least it will mean less work for me!
Mm.. should be enough for now. Comments?