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I think you have to consider case by case. Rules may not fit for everyone. I wouldn't sacrifice the accleration of the younger sibling for the sake of older one (that wouldn't be fair especially the younger kid is PG and older kid is in grade). But at the same time, you have to look at the family dynamics, psyche of both kids, etc....
Agreed!

Here is the commentary shared on Hoagies Gifted Education Page.

The IAS states, in part:
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"4. How important are the age and school grade of siblings when considering acceleration? ... While we have heard anecdotal information that skipping a child into the grade of an older sibling has had positive results, our experience and training in family dynamics speaks against such a move. Although each family is unique, the Belin-Blank Center remains consistent in consulting with schools and parents against a grade skip under these circumstances."
This is just one of 15 issues with case vignettes in the book. Parents may wish to also consider the other factors in weighing their decision.

For example: If the older sibling has a misfortune (medical issue, accident, etc) which may preclude their completion of a grade level one year, would the parents also have the younger sibling held back that year to prevent the two from being in the same grade level the following year?

Parents may also wish to consider whether the younger sibling may need and/or benefit from multiple grade skips, in which case the move to the older sibling's grade level (and social circle) may be viewed as temporary with plans in place for rapid transitioning to the next grade level up.