Consanguinity should only be changed if it is not previously set, but detected in the pedigree

Description

Steps to reproduce the problem:

create patient and click "Y" on consanguinity; save
create pedigree; use any non-consanguineous template; save
close pedigree
PROBLEM: consanguinity was overwritten to "N". Patient may know that there was consanguinity in the family, without knowing details as whose relationship in the family tree was consanguineous.