Need help, how can this be done as a Monohybrid Cross Punnett square

An inherited trait among humans in Norway caused affected individuals to have very wavy hair, not unlike that of sheep. The trait, which is called woolly, is very evident when it occurs in families; no child possesses woolly hair unless at least one parent does. Imagine you are a Norwegian judge, and that you have before you a woolly-haired man suing his normal-haired wife for divorce because their first child has normal hair. The husband claims this constitutes evidence of infidelity on the part of his wife. Do you accept his claim? Justify your decision.