Here are some of my favorite products.  Speaking as a mom myself, I think mothers are always happy to get some nice, higher quality skin care products for Mother's Day.  I have not included any drugstore products here, some of which are excellent (like Cetaphil, CeraVe, Vanicream).

Blueberry Soy Night Recovery Cream ($64).  I use this organic moisturizer daily and love its smell and texture.  Whenever I have given it as a gift, people love it. 

Dermalogica Total Eye Care ($41).  A great eye cream with sun protection, and not stratospherically expensive, like some other eye creams.

Lemon Cleanser ($36).  Another organic product that I use and that is very popular at my medical practice.

TNS Essential Serum ($247).  Hugely expensive, but perhaps you and your sibs can share the cost of this.  The best anti-aging ingredients in one product.  Check out the reviews at SkinCareRx.com, too.

Or you could put together a little basket of products, including the Jane Iredale Lip Drink ($10.50) and the Iredale Pom Mist ($17.50), perhaps with some Lemon Cleanser.

See Dr. Irwin's Top 100 Skin Care Products

See Dr. Irwin's new article on skin care product ingredients -- what are things like peptides and do they work?