Relative Strangers (1999)

Maureen is an Irishwoman, happily married and living in Germany. Or so she thinks. When her husband dies, she finds that not only had he debts, but was also a bigamist, having had a second wife and family in Ireland. Shocked and angry, she travels there to meet the other family. And she learns that they have troubles of their own, the worst of them being that the other woman's young son is suffering from leukemia and a suitable bone marrow donor is urgently needed.