The last Will that was made by your mother will be valid - Wills do not expire, even after thirty years.
Section 117 of the Succession Act provides for applications to be made by people whose parents have not provided for them in their Wills.
It would also be relevant in cases where a person has taken care of a parent or worked in a family business to their own detriment, for example giving up the opportunity to go to college or to work in order to do so. It would also be relevant in that case whether you had any legitimate expectation of receiving remuneration for caring for your mother, and whether you suffered any financial loss as a result.
I would advise you to make an appointment to see a solicitor about this.... there is a lot to consider - not least of all you will want to consider the likely outcome of any action that you take in terms of costs (which would come out of the estate no matter who wins any case) and also in terms of stress (including your relationship with your sister etc).
Thanks CM - I think I'm more sore that my sister doesn't seem to consider my contribution to my Mother's welfare relevant. However I think you are right in what I have to consider, and I would admit I didn't look after Mom for money. My own instincts is just to let it go and let things take their natural course - although in so doing the family home will be sold, and I guess I'm aggrieved that instead of 50/50 an offer hasn't been made. If I let things go at least cost and friction can be ultimately avoided, I guess!! But thanks for your advice.
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