Here are some websites that might help
This one shows pictures of adult colors at the bottom.
http://www.pandecats.com/x/himalayan_colors.htm My Sophie's Great Grandfather is pictured as an example of chocolate point (GC New Destiny's Something to Remember)
Description of adult colors at bottom of this page. Nose leather and paw pad colors can really help in identifying those colors.
http://www.chocolatecats.com/persian-kittens.htm
This is a really young blue point kitten
http://www.volny.cz/destepaws/kitten...eks2_small.jpg
This is a seal point at 4 weeks
http://www.volny.cz/destepaws/kitten...point_5039.jpg
I'm thinking most or all of your kittens are seal points...just still light right now...they darked quite a bit as they get older.
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~Magnifique Yorkies~
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Educate yourself and buy from reputable breeders or rescue.