It sounds like you have both family history and spider senses run amuk - two really good reasons not to wait and see. If there actually are LDs going on, waiting is not benign.
Dyslexia in particular is so much easier to remediate the earlier you catch it. The Shaywitz book (dyslexia.yale.edu/book_Overcoming.html) includes detailed markers of dyslexia at even very young ages, and may be useful to help you try to figure out if there is an underlying phonological deficit going on.
Be forewarned, though, that a verbally gifted kid won't show many of the usual markers, or in the usual ways; the signs may be there, but much more subtle. My DD, for example, always loved to rhyme (usually a big challenge for dyslexics) - but the hint was that even as she got older sometimes seemed to not notice the difference between rhyming and alliteration. As it turned out, when tested, her "phonological awareness" was 88th percentile - she could have passed an overly-simple screen with flying colors. But her ability to manipulate those phonemes plummeted as the task got more complex, down to 10th percentile for the harder tasks.
Dysgraphia I will leave to the many deeply experience folk on the board, with the question: if he were supported and accommodated for dysgraphia now and his challenges ended up reducing over time, is there any way those accommodations could cause harm, or just help him work through a difficult period?
