men, elves and orcs?

[elven maiden Earwen]

This is a weird theory i came up with:
In the first age Morgoth captured elves that wandered alone in the north. From these elves he bred orcs. Orcs are mutated elves. What if an elf that was captured had reletives? Orcs most likly reprodused to multiply. Would a elf that was a reletive to an elf that was captured be related to a orc and its reletives? In that case many elves are related to men so every time an elf or man killed a orc wouldnt there be a possiblity that they are relatered? In that case wouldnt it be considered kin slaying?

This is a strange theory I came up with after seeing "The Two Towers" in my spare time. Do you think anything I said might have been posible?