اَلسَّلَامُ عَلَيْكُمْ وَرَحْمَةُ اللَّهِ وَبَرَكَاتُهُ

As-salaamu 'alaykum wara'hmatullaahi wa barakaatuh

Peace be upon you, and the Mercy of Allah and His Blessings. To give salaam upon all is sunnah. Giving salaam upon spouse and family members is additional sunnah. It is recommended and have special rewards and those who have this character, this below mentioned hadith give glad tidings. Abu umama (RA) said that, Rasoolullah (ﷺ) said, “Allah will give guarantee and protection for three kinds of people. If he live then all of his matter will be protected by Allah and if he die then he will enter into jannah. (First one is) He who give salaam before enter into the house, he will enter in the protection of Allah….”

Reference: Hasan (Ibn Hajar). MIshkat: 4/316