Wrong. We get 100% of our cells from our mothers She grows every cell. The (1) cell contributed by the father, the sperm cell, is destroyed in the process of DNA exchange/fertilization. Only the egg cell remains, fertilized with 50% DNA from each parent, and it then begins to divide of course. And all of those divisions are of the mother, inside the mother, from the mother's body. Every cell is created by your mother.
DNA is a different thing, our DNA is in all of our cells, and the information of that DNA is 50/50 (except mitochondrial DNA which 100% mother), but the actual physical amino acids of that DNA were all made by the mother's body.
Eg I make a sandwich. 50% of the recipe came from me, 50% from Martha Stewart's cookbook. I provide all ingredients, I make it, I eat it. Martha just provided instructions on how she makes hers and I replicated half of that along with half of my ideas to make a new sandwich.
Men only provide 50% DNA at conception which is 50% INFO, not actual biological material, not cells.