That’s true for nuclear DNA, but there’s genetic code outside of your nucleus, mitochondrial DNA, that you inherit 100% from your mother.
And that’s only talking DNA, but you’re more than your genetic code. All of the organelles, lipidic membrane, cytoplasm… was generated from the egg material.
Splitting a Helium atom would require energy, not release it. Up until iron, fusion releases energy. For larger atoms, it’s fission that releases energy.