Agreed that during meiosis, crossover is not as common, as the paired chromosomal diploids are eventually sliced into four chromosomal haploids through a two step splitting process. However, by the time the teste cell is programmed to undergo meiosis, crossover has occurred many times. This occurs with cell multiplication from within the developing embryo and that eventually leads to specialization into organs, such as the testes.
You are always 50:50 your parents' DNA, but the percentage you are of any given grandparent's DNA can greatly vary due to this fact. That is why siblings often favor one of their parental lines and the other sibling more resemble the other parents'.