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I am sorry for your loss.
You have to retain a lawyer that does estate litigation.
There is a lot at stake and from what you say in your post the facts are very strongly in your family's favour.
She does not sound like she was mentally competent to sign a Will and so this Will may be invalid and for this reason any older Will would be valid. If there was no Will at all then she would have died intestate and then her estate will go to your parents unless she has a legally married spouse or children.
What you can do to find a lawyer is one of the following things.You can contact the Law Society and use their Lawyer Referral Service. You will be given the name of a lawyer and can consult with the lawyer and the first half hour will be free.The number is:1-***-***-**** or(###) ###-####(within the GTA)Or you can check on a site called lexpert. This is a legal directory of leading lawyers and law firms throughout Canada and is well-respected by the legal community.Here's the link to their website:http://www.lexpert.ca/Directory/DirectoryContent/FindLawyersOrFirm.aspxI hope that helps as a starting point.
I understand what your question was but the issue isn't really about a potential forgery. It is possible the signature was forged. But it is possible that your sister was too ill to sign her regular signature. It is possible she asked for help in signing.
There are plenty of handwriting experts and any lawyer you hire to sue will be able to find one.
But your strongest position isn't about whether this signature was forged as the lawyer is certainly going to say it was not. It is about whether your sister had testamentary capacity or not.
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