Our expert says:
It is essential that your father write a proper will as soon as possible, dealing with the assets you share, and the repayment to you of all he owes, leaving the assets to you, whatever seems best, and this will need consultation of a good local lawyer.
Have you talked to your mother about the appearance on the horizon of this half-sister ? You could mention that you are well aware of the pain she was caused by what your father did in the past, and don't want to hurt her, though you al;so recognize that the half-stster, as indeed any children born in such circumstances, is herself innocent and not part of the original problem. Maybe she will be able to agree that there is no problem in you making contact with the half-sister.
My cat fully agrees with Liza's example of the cat accidentally denied a proper litter box - and cats do look embarrassed on such occasions, when they know they have done something wrong ( which is a lot more than people like your father often do ).
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