foster

/ˈfȯ-stər/

Middle English, from Old English fōstor-, from fōstor food, feeding; akin to Old English fōda food

adjective

having, relating to, or being the relationship between a foster parent and the child who the foster parent cares for
being, relating to, or involved in a situation in which temporary care is given to an animal (such as one that is injured or awaiting adoption) in a household or similar setting

Although both girls lived with Ms. Ayala, Millison was the only one who was officially placed in her care as a {phrase}foster child{/phrase}.

to act as a foster parent to (a child)
to provide temporary care to (an animal that is injured, homeless, etc.) in a household or similar setting
to promote the growth or development of : encourage

The couple said they get … updates and pictures from all the children they've fostered.

… it's just her luck she'd find a partner who not only adores dogs but fosters them for a Sacramento animal shelter.