1 Politeness With Parents: Allah SWT has said it several times in Holy Quran "Wabil walidaini ihsana" which means treat your parents well. Quran has declared harshness with parents Kabira Sin and Haram. A Verse of the Holy Quran says don't even say Ufff to your parents. Hadith of Prophet SAW says treat your parents well even if they are Mushriks.
2 Politeness With Wife: Islam also talks about treating wife with politeness. Rasool Allah SAW said that man is the best who threats his wife good and politely and that man the baddest who treats wife harshly. Rasool Allah SAW has ordered to treat wife equally in another Hadith.
3 Politeness With Kids: There are several Hadiths of Prophet SAW which guides us that how we should treat our Kids? A hadith of Prophet SAW says that person is not from us who not loves the Kids and not respects his elders. Before Arrival of Prophet SAW In Arab Society daughter was considered a burden. Many people used to buried their daughters alive. After arrival of Islam daughters also got respect and right in the Society.