MOTHER and/or FATHER
Any type of companionship that is essential to a household/community; appreciation for community increases with time passing and grows greater understanding of needs for all incorporated/affiliated
Josie: "Well Mary, when you feel the relationship will bring an appreciating asset you need to ask 'What's important to me?'"
Marc : "Damn your house is clean, no wonder you got married so soon"
Joe: "Well you got to know what needs to be done and find a way of getting it all taken care of"
Marc: "Always wondered if that Mary-Lou would have been as an appreciating asset as your little lady."