Madurai, Feb 9 (PTI) Tragedy struck a family when 15 of its members drowned after their van plunged into a roadside well at Nakkalaikottai, about 30 km from here, tonight, police said. The family members were proceeding from Thevaram in Theni district to Tuticorin to attend a marriage. The van hit the median on the road and fell into the 25 ft well, police said. Three persons were rescued from the well by locals, police said.