No Supo Dar Razon

[Joseph Puentes <makas@...>]

has anyone done study on this phrase. When the grandparents are missing 
and "No supo dar razon" is inserted what exactly does that mean? That 
the Son didn't know who his parents were? But if this is the case then 
why would there be records before and after where they are given? Or 
that he might have had a temporary case of of abnesia (sp--?).  Or that 
he just didn't want to disclose them?
Also I have a couple of records where only one grandparent is listed but 
many more where both are given.
So what gives?

No se dar razon!

thanks,

joseph