'Home' is a leitmotif used in relation to the Dreemurr household, primarily appearing in Home and its variations, as well as in SAVE the World and Last Goodbye.
A variation of the motif seemingly appears as the backing melody of undertale (unused) (covered below).
Ultimately, the song It's a Redline Day from Redline inspired Toby Fox to rewrite the song and its backing, which then served as the basis for Memory, the origin of the 'Memory' leitmotif. (See: 'On the Origins of Undertale and Deltarune's Leitmotifs').
Notably, this older backing reappears in the final song, albeit in the background, as covered below.
Worth mentioning is that 'Home' exclusively appears alongside the 'Once Upon a Time' leitmotif, reflecting its use in Home.