Sanford and Joan Weill

Sanford and Joan Weill

Ramin Talaie/Bloomberg

Sanford "Sandy" Weill and Joan H. Weill. The Weills often make joint decisions when making gifts to charity. A Center on Philanthropy at Indiana University study released today shows that 48 percent of high net worth women make joint decisions while 41 percent of men said they consult their wives on giving choices.