Waterfalls wrote:
... what to say to your child when you know something that when they know (and they are going to figure out at least part of it) could hurt them.
As soon as they are old enough to know what you are talking about and can understand the explanation.
Telling your child she is adopted after keeping it secret from her for 30 years might be alright; but waiting until one of the kids at school tells her in a moment of spite at age 7 might be devastating to her.
For example, I knew something was odd about my date of birth as soon as I learned to count up to nine; only to have my suspicions confirmed by a relative who may not have approved of my parents' "forced" marriage 7-1/2 months before I was born, and which precipitated a fight between my parents when my dad blamed me for their marriage and my mom said she never wanted to marry him in the first place.
Try living with THAT for 50+ years!
Had my parents calmly explained it to me first, in a kind and loving way, I might not have had so much difficulty with self-esteem.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.