You have the right to take the sums deducted from your father's salary, and that is Halal just like the rest of the estate.
The bank interest should be spent in charitable ventures. The same applies to the Liras that take the same ruling as the estate, except for its profit which should be spent in charity, rather than building Masjids. (Part No. 13; Page No. 516)
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.