What a beautiful family. Since Topaz is a stone/gem, how about naming them all after gems? Gonna need some help here.

Topaz, Amber, Citrine (all yellow/orange) colors
Sapphire (who knew they came in yellow/orange?)

http://www.gemsuite.com/gemstones/sa...to_orange.html

or orangie fruits and vegetables?

Orange, Peach, Pumpkin, Apricot, Tangerine, Citrus

I'm sure they'll tell you their names soon.