Question

Why do we not look like our parents or siblings eventhough we inherit genes from our parents?

Answer 1

Because you not only have their genes but also the genes of ancestors which may vary and you are a mixture of them. It's like the proportion of genes varies in every person of the same family.

Answer 2

Because each parents give half of their genetic material to their children.This creates a unique combination of parents' genes.The combination for each child is different.So we look different.