Distribution of property
The property of an intestate devolves upon the wife or husband, or upon those who are of the kindred of the deceased, in the order and according to the rules given below.
Where intestate has left widow and lineal descendants, or widow and kindred only, or widow and no kindred.
Where the intestate has a widow-
1. if he has also left any lineal descendants, one third of his property shall belong to his widow, and the remaining two-thirds shall go to his lineal descendants, according to the rules here in after contained;
2. if he left no lineal descendant, but has left persons who are of kindred to him, one-half of his property shall belong to his widow, and the other half shall go to those who are of kindred to him, in the order and according to the rules here in after contained:
3. if he has left none who are of kindred to him, the whole of his property shall belong to his widow.
Lineal descendants mean descendant born in lawful wedlock only.
As per the above rules, your sister is entitled to a share in the properties left behind by your father,
The settlement made by your mother will not be legally accounted in this distribution.