public bool BothParentsAlive(FactDate when)
{
if (Husband is null || Wife is null || FamilyType.Equals(SOLOINDIVIDUAL))
{
return(false);
}
return(Husband.IsAlive(when) && Wife.IsAlive(when) && Husband.GetAge(when).MinAge > 13 && Wife.GetAge(when).MinAge > 13);
}