Eve = children quarter vampire quarter lycan if she has one
Eve = grandchildren = 1/4 lycan vampire if she has one
Eve = great grandchildren = 1/8 vampire/ lycan so on if she has one
Eve = children quarter vampire quarter lycan if she has one
Eve = grandchildren = 1/4 lycan vampire if she has one
Eve = great grandchildren = 1/8 vampire/ lycan so on if she has one
If Selene is 2/3 Vampire 1/3 Pure Immortal.
and Michael is 2/3 Lycan 1/3 Vampire.
Eve should be: 2/4 Vampire 1/4 Lycan 1/4 Pure Immortal.
She's not actually half and half. She is a Vampire dominant species type of Hybrid.
As for her kids... I guess, their dominant species would depend on their father's species.