It is new none the less, because itś half of the fatherś DNA plus half of the mother's DNA combined in one fertilized egg cell.
So this human first cell is not the mother or the father, it is a new human being in the first stages of development.
Alright, it is the life of the parents that is inherited by the newcomer.
But from the point of conception (egg cell fertilized) onward, it is a new human life by itself.
But it still has to develop into a baby ready to be born.
So where would we then draw the line?
When is the stage reached that we can speak of a person?
I mean, assume a woman gets pregnant when she didn't want to? (failing preservatives, rape, ... )
And / or it would be better not to go through with it? (physical reasons, psychological reasons, ... )
How long can you wait to decide?
"New human first cells" (to roughly quote you) is correct, but you have no warrant for calling it "a new human being in the first stages of development." I'll grant you the NEW DNA part, but DNA does not a person make, as in the case of cancer cells and the severed arm. It has potential to become, to be built into, to develop into an actual person baby, but what is "potential" includes the element of being not actual, not actually a person.
To answer your question, at birth is when it becomes a human being. See post #76.
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