why siblings with two biological parents look similar?

Question

in terms of gens and chromosomes

Answer 1

because children get 23 chromosomes from each parent so they would look alike

Answer 2

In terms of genes and chomosomes, they inherit 1/2 from each parent. Genes and chomosomes determine looks as well as many other characteristics so naturally they can look a lot alike.

But, not exactly alike unless they are identical twins since each parent can contribute one half or the other half of the genes they inherited from their own parents.