Habitat for Humanity

I don't know where to begin.....My mother in law, describing her, or to the event itself?  In short my mother in law is the most selfless, giving person.  For her 80th birthday, instead of doing something fancy in the town in which she grew up, Winnetka, Chicago, she decided to get our whole family, 18 people, together to build a house for Habitat for Humanity in San Diego.