The recent foster parenting introductory seminar I was at spoon-fed us an answer that our local area wanted to hear on the question -
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They wanted to hear that we like being parents/parenting
That we want to make a difference in society
That we "consider raising children one of the most important jobs in the world"
And that we "believe fostering will be personaly rewarding to my family because..."
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I think that maybe one example from your life as to why you are interested (pick one, you have many!), and touching on the points above would be more than adequate.
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Tjej
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ETA: Boy, I sound cold in the above. I should say that I totally get what you mean about not knowing what to say because you have so much to say about it. I am that way too. So I found it helpful that it was pared down and straightforward in that format. HTH.