Martha Wayne is the mother to Bruce Wayne aka Batman.
— IMDb (@IMDb) January 22, 2016
Batman V Superman: Dawn Of Justice synopsis reads:
Fearing the actions of a god-like Super Hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day saviour, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before.