1 to look after for a period of time; to bring up a child that is not one's own: “She fostered the children for several months.”
in het gezin opnemen

2 to encourage or give help to (ideas etc): “She fostered the child's talents.”
cultiveren

'foster-brother (nouns)

a child that has been fostered in another child's family.
pleegbroer, pleegzuster

'foster-child (Zelfstandig naamwoord)

a child fostered by a family.
pleegkind

'foster-parent ('foster-father (Zelfstandig naamwoord)

a person who looks after a child not his or her own.
pleegouder
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Vraag professionele hulp bij het schrijven van zakelijke, academische of persoonlijke teksten in het Engels door native speakers.

to foster	voeden (ww.)
foster	aanmoedigen

Bronnen: Vlietstra; MWB