you are so ambitious!
6 yr old boy: what about crayon caddies/rolls? or an arts and craft apron?http://www.craftster.org/forum/index.php?topic=182261.0http://www.craftster.org/forum/index.php?topic=311712.0
FIL is tougher. Guess it depends on what he is into. Gardening cushion to protect the knees? Patchwork felted hat from old sweaters? themed walled to match his interests? something to match MIL's gift?? did you see this forum:http://www.craftster.org/forum/index.php?topic=310229.0
cousins 4 & 5 are teens? readers? music enthusiasts? gamers? how about "TIME with cuz" coupons for 2010:
'this entitles you to an afternoon of music and catching up at my house' or ' you may choose any title in the neighbourhood bookstore on me in the month of February'
Keep us posted on whatever you decide...