calculator and notepad placed over stack of usa dollars

Zakāt on undistributed inheritance due to family dispute or legal problems

A person’s father had passed away 19 years ago and he left behind some money (savings in bank account). The family had no access to this money until a few days ago. Now the money has been distributed according to islamic inheritance. They knew they would receive the money eventually but didn’t know how much. The question the family are asking is, do they now have to pay zakat for the past 19 years for their share?