For the woman who is providing the clubhouse - how about a Lush gift? They come beautifully wrapped and are sooooo wonderful -
www.lush.com
For your family - how about a gift certificate for a picture book? You know, the ones where you put them together on-line with your pictures and then are mailed a hardcover book. Your mother and stepmil can wait for your baby's arrival and make a wonderful brag book, and your sister could make one of her baby now.
www.picaboo.com is one place - I think shutterfly and kodak do them, too.