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Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Research in Developmental Disabilities. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Research in Developmental Disabilities, 34, 3, March 2013, 10.1016/j.ridd.2012.11.020. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

These in-depth parent insights can help target the needs of individuals with WS and emphasise that an individual approach to intervention will be essential because of the heterogeneity of the WS social profile.

2 79 ing families but rather those which belong to a same exogamous group, as notably in the case of clans and moieties. Moreover, the various extensions of the incest group, for example, to children of artificially created blood-brothers, or children of ceremonially knit comrades, and, in some societies, to those who have the same family name, or are godparents of the same child, seem to indicate that close social and psychological ties tend to rule out intermarriage. Conversely, intermarriage commonly does not create intimate ties or alliances in the primitive world, as usually it does not do so in our culture. What happened before history, outside the realm of technology, is, I suppose anybody's guess. To paraphrase Lord Timothy Dexter, it seems to be a time for guessing, so I guess I will do a little myself.