Will my child develop aspergers/adhd if there's a history in my family but i don't have it? please help me docs!

Possible: Autism rates are increased when there is a family history. It is common for many people to have parts of it - anxiety, language delay, etc. When all the parts are there, we call it an autism spectrum disorder.

Not much more likely: If truly the biological parents are not having these syndromes then the chances are only slightly above the general population if at all. See http://www.nchpeg.org/index.php?option=com_content&view=article&id=120&Itemid=118. for a good summary of heritability of many psychiatric syndromes. Take care