Cergorach
The Laughing One
These days it might be 25, but in medieval times it's more like 15-20 years. Let's not forget that you where considered an adult at a lot younger age then you are now. Children where married at a young age and as a result where expected to have children at a young age.
It's also important to note that it also depends on which family line is being counted for generations. Currently my family line would count each generation as 30 years. Consider a family of adventurers, they would probably marry at a late age and have children at a late age.
You could give the whole situation extra debt by saying that the family has been cursed for x generations and have the pcs later find out what exactly a generation is for that family. For example tehy could meet a part of the family great-grandma 90, grandma 60, ma 30, and a firstborn 0. Or they could be walking in the graveyard and find tombstones with names and dates on them...
It's also important to note that it also depends on which family line is being counted for generations. Currently my family line would count each generation as 30 years. Consider a family of adventurers, they would probably marry at a late age and have children at a late age.
You could give the whole situation extra debt by saying that the family has been cursed for x generations and have the pcs later find out what exactly a generation is for that family. For example tehy could meet a part of the family great-grandma 90, grandma 60, ma 30, and a firstborn 0. Or they could be walking in the graveyard and find tombstones with names and dates on them...