That is completely wrong.
First, learn the difference between the Big Bang theory and evolutionary theory.
Second, evolution works on the premises of natural selection. Those who cannot pass along their genes are removed from the gene pool. Since humans have effectively stopped evolution due to allowing the weak to pass along their genes, and since evolution takes place over a huge amount of time, your conclusion that children must be smarter than their parents is totally wrong.
Third, as a by the way, evolution is not necessarily geared towards more complex life. It produces life that is best fit to survive, whether it be bigger, smaller, faster, slower, more intelligent, less intelligent, etc. If a small slug can survive more effectively than a gibbon, then the gibbon will be weeded out.