Bad science abound.
Presuming we have Bob and Jane as you’ve described them (a huge presumption), Bob will have a complete set of genes, half of which he inherited from his mother, and half of which he inherited from his father. All of his genes put together are not on one strand, but 46 separate strands. 22 of these are very similar to another 22, but one set of them are from mom, one set from dad. These 44 chromosomes are each a long linear chain of double stranded DNA, which means they have a left half and a right half, and those two strands stay stuck together during all of the parts of this process you’re concerned with. Together, these 44 chromosomes are called Autosomes, which means they’re not the Sex chromosomes. Another one is called X, and he got it from mom. It doesn’t look or smell or taste anything like an X. It’s a linear chain of double stranded DNA. Another is called Y, which he got from pop. Again, it’s a linear strand of double sided DNA, which we’ve designated Y for convenience. These are called Sex Chromosomes. Forty-four plus two brings us up to the requisite 46 pieces of double stranded DNA.
Jane is similar, but her forty-sixth strand is a duplicate of Bob’s forty-fifth.
Now… When Bob and Jane get together and be incestuous, the relevant cells from Bob (called sperm) and the relevant cells from Jane (called ovum) combine into one. Remember that the one cell that’s combined has to have 46 chromosomes; two copies each of 22 autosomes (for 44), one X chromosome, and one chromosome that’s either an X or a Y, to determine the gender. The reason why this child isn’t another clone of Bob is this: the combination of which autosomes it got from Bob came from Bob’s mom and which came from Bob’s dad are completely random. Indeed, even portions of the same autosome can come from both grandma and grandpa. There’s a process called recombination or crossing over that occurs when sprem and ovum are formed that amounts to shuffling a deck.
So we now have an interactive example. Imagine, or acquire, two sets of 52 card poker decks. It’s better if you have the bicycle brand cards, a red and blue deck. Both decks contain the same cards, both have a King of Hearts and a Queen of Diamonds and so forth. Each deck represents a person. Bob is the blue deck, Jane is the Red. Shuffle each deck, and pull out the first two cards of each value you come across. Pull out the first two kings from the red deck, the first two queens, etc. Discard the remainder of the red deck, and do the same for the blue. Now combine the cards you pulled out and have a look at what you’ve got. You have a 52 card deck, which has the correct number of kings, queens, and on down the line. But the combination of suits which you have in your new deck (the baby) aren’t the Spade/Diamond/Club/Heart which Bob originally had and Jane copied. You’ve got potentially a 7 of hearts, two 7’s of diamonds, and a 7 of clubs. You have the right number of 7 cards, four of them to be precise. That’s the same number Bob started with. But it’s got a unique combination of those 7’s which doesn’t resemble what either Bob or Jane had. You also have no 7 of noses, or some other suit which you didn’t have to start with.
Nothing new was created when you divided your decks (simulating meiosis, or creation of sperm and eggs), but you wound up with something unique when you combined a sperm with an egg. Everything in your baby is clearly derived from Bob, but it’s not a clone of him.