We acquire characters from our parents.The is because our 46 chromosomes in each cells is from our parents (23 each). some characters which is transferred from the parents through grandparents may be mute in their genes. These properties may transferred to offspring(children).Therefore nearly 25 %of our characters may be from our grandparents. Detaily,
The method that determines which traits are inherited from each parent by the offspring(children) is known as homologous recombination, and this process is (essentially) random, and thus you end with ~50% of your traits (the alleles of the genes) from each parent, and ~25% from each grandparent, so you are right in this respect.
This is, however, a generalization; due to the chance nature of the recombination it is possible that you may inherit more traits from one grandparent in comparison to another, but this is unique to each individual