Are there any alarm clocks that show lights or talk for both am and pm as the elderly get confused?

Yes. Some are quite expensive but offer more features. I found this one: http://www.bathroomfurnituredirect.com/asp/show_detail.asp?sku=SST1003&refid=BR98-SST1003

and this one:

http://www.Walmart.com/catalog/product.do?product_id=11321007&sourceid=26415431620997865705