The rest- the rest you can guess. Walter turned the both of them, not just Sara, because Mathias was useful. Leon arrived to find Walter dead and the stone completed, and it became the source of your father's power. Sara couldn't stand the hunger, and chose to die to complete the whip.
Your father never forgave Leon for being the one to kill Sara. Leon never forgave him for being the one to make Sara choose death. They both turned to the task of protecting Europe from others like Walter in their own ways - the Belmonts by day, and Dracula by night. They both fled France out of respect for Sara, so her family name wouldn't be darkened further by their actions. They came to Wallachia, and Leon built his home where they had meant to bury Walter.
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Your father never forgave Leon for being the one to kill Sara. Leon never forgave him for being the one to make Sara choose death. They both turned to the task of protecting Europe from others like Walter in their own ways - the Belmonts by day, and Dracula by night. They both fled France out of respect for Sara, so her family name wouldn't be darkened further by their actions. They came to Wallachia, and Leon built his home where they had meant to bury Walter.
Pair of fucked-up families.