A foster family has a fairly strictly defined relationship with the person they’re fostering. They have some legal responsibility for the person for at least a short period (fostering can be a short term thing, for weeks or months before return to the birth family, OR it can be long-term/permanent), and they’ve usually undergone some kind of screening or background check beforehand. They may be receiving money from the relevant authorities to help pay for the person they took in.
A surrogate family is a lot more vague. Basically surrogate means substitute. If your family life is shit, your best friend’s family may be emotional surrogates for you and fill that need for warmth and stability. Or a woman may be a “physical surrogate”, carrying someone else’s child to term in her own body as a substitute for them because they can’t.
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