1) since daughters have claimed share in property as legal heirs you have to apply for probate to prove that will is genuine and represents last will and testament of your father .
2) your father must have appointed executor of will . he has to apply for probate .
3) i presume that alteast one of attesting witnesses is alive .
4) affidavit of Attesting witness should be enclosed to probate petition to prove the will .
5) if probate petition is not contested you can get probate in 6 months .
6) in the event daughter contest the will petition would be converted into testamentary suit .
7) it would take some years for testamentary suit to be disposed of
8) amicable settlement is best option