I think you should pick either bloodline or lineage and scrap the other. They're essentially the same mechanic, except taking up twice the headspace, so I don't think it's worth it to have both. You can always expand from one to the other in the second set.
1. Kandor is not-Medieval Britain. There's a lot of forests, glens, and rolling countryside. Except not-Wales, which is rainy and misty all the time forever.
2. House
is the archetypal medieval kingdom. Castles, farms, knights and so on. There is a church that employs paladins to defend the kingdom. The wise queen is beloved by her people but not actually very good at statescraft.
House
is an archmage's domain where all the nobles have magic in the blood. Faeries are treated like house-elves in Harry Potter. Owls are a thing. The grand archmage is a very old Merlin figure who spends all his time maintaining the magic that sustains the kingdom.
House
is a grim kingdom of witches, black forests, and forbidding keeps. They consort with goat-headed demons and muster armies of death knights. The king and queen are Macbeth-like undying vampires who rule together. The dark forces that give them power have promised them that if they bathe in blood every fortnight they will never die.
House
is a loose collection of not-Celt barbarian clans. They do crazy things like play bagpipes and rush into battle naked. Their armies include giants. The most influential clan leader is a female warlord who is unanimously agreed to be the most badass person in the highlands.
House
are a secretive druidic circle in the enchanted forest. They are faeries and elves or "wild folk" who live in harmony with the natural world, using wolves as hunting companions. The faerie queen is an inscrutable ancient being who appears in the deepest part of the forest every hundred years.
4. The protagonist is a farm boy discovered to have noble blood, wow!
5. House
uses bog-standard medieval army ranks. House
is similar but the lower ranks are all expendable undead. House
uses battlemages and summoned creatures. House
has different specialized teams inspired by nature. House
has only three positions: warrior, bard, and clan leader.