Glossary entry (derived from question below)
anglais term or phrase:
Local Authority foster care
français translation:
[ont été placés] en famille d'accueil
anglais term
Maroc
A Ph.D. at your service!
Native in: anglais (Variants: UK, US) 
, arabe (Variant: Moroccan) , français (Variants: Moroccan, African, Standard-France)
Works in: anglais vers arabe, arabe vers anglais, français vers arabe, and 14 more.
Local Authority foster care
| 4 | [ont été placés] en famille d'accueil |
B D Finch
|
Aug 13, 2020 10:51: changed "Kudoz queue" from "In queue" to "Public"
Aug 14, 2020 11:33: Rachel Fell changed "Level" from "PRO" to "Non-PRO"
Aug 18, 2020 12:16: B D Finch Created KOG entry
Non-PRO (3): Tony M, Yvonne Gallagher, Rachel Fell
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Proposed translations
[ont été placés] en famille d'accueil
Le placement en famille d'accueil est beaucoup plus fréquent. Placement in foster care is used much more often. Environ 400 enfants sont placés en famille d'accueil ou dans des foyers collectifs. Approximately 400 children are in foster care or in staffed group care facilities.
I think the "local authority" bit can be omitted, as I don't believe any body other than a local authority would be responsible for organising foster care. If I'm wrong about that, then leave it in.
Discussion
Donc,
« Les enfants ont été placés dans un foyer d'accueil relevant de l'autorité locale où ils sont restés jusqu'à présent »
Sans plus de contexte, on ne peut savoir s’il s’agit d’une autorité locale municipale, communale, provinciale ou autre et de quel pays il peut s’agir.
The exact formulation will depend on precisely how this term appears / is being used.