When beloved Prophet (PBUH) reached home in the night he'd present his Salam with such a voice that the people who were awake would answer it while the sleeping people will not be disturbed. (This is how he(PBUH) delivered the rights of the people in the family.) Hazrat Abdul Haq Muhaddis Dehlawi (RA) said that this much of love of the family members is necessary so that it induces you to deliver their rights. By presenting Salam to the people in the house one receives abundance (barkah). Barakah means that necessities are fulfilled with small amount of means. Lack of barakah is the state when you have to spend hundreds for a work that is worth tens only and thousands for a task that is worth hundreds only. Beloved Prophet (PBUH) used to present Salam even to the empty house.
(Sitting (Majlis) on Wednesday, December 21, 2011)