Sorry, Beesan16, I can't help with curls. But it is really cute that you will take care of your little brother's hair.
And a picture of this little fellow would be really adorable

CURLS has a great product for curly hair.  Their kids' line will help you out.  Check it out at www.curls.biz

Poor Maggie. My mother was 9½ years older than her younger sister, and has a story very similar to yours. The two are not that close in their adult lives, though.

I once thought about using Johnson's baby shampoo for myself, given the mildness of the ingredients:

The Original Johnson's Baby shampoo: Water, Cocamidopropyl Betaine, PEG-80 Sorbitan Laurate, Sodium Trideceth Sulfate, PEG-150 Distearate, Fragrance, Polyquaternium-10, Tetrasodium EDTA, Quaternium-15, Citric Acid, Yellow 10 and Orange 4.

Johnson's Baby shampoo with Natural Lavender: Water, Cocamidopropyl Betaine, PEG-80 Sorbitan Laurate, Sodium Trideceth Sulfate, PEG-150 Distearate, Fragrance, Polyquaternium-10, Tetrasodium EDTA, Quaternium-15, Citric Acid, Ext. Violet 2

Johnson's Baby shampoo Detangling formula: Water, Cocamidopropyl Betaine, PEG-80 Sorbitan Laurate, Sodium Trideceth Sulfate, PEG-150 Distearate, Fragrance, Polyquaternium-10, Tetrasodium EDTA, Quaternium-15, Citric Acid, Red 40, Yellow 10

All of the formulas are pretty much the same. Hope it helps.