(If I remember inheritance laws corect)
the child get 1/4
and the wife get 3/4,
other relatives get nothing.
That's IF it can't be legaly questioned the wife/ dead husband are owners to the WHOLE property for instance by they only inherited PART of that property.
If it's a "Rights" type of property AND they (including the dead husband) have paid property tax at least 10 years, they have CHANCE to get it TITLED, which would be full EVIDIENCE it's theirs. (It has to be back from close after WW II to be SURE to be approved, but minimum 10 years has chance to be approved, many are.) If apply and if it's approved, they get the title for a rather small fee. But all property tax need to be paid.
If it's Titled allready, they just need to transfer the title to the mother's name or include the daughter too.