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Hi thank you for your message, please note that I will look to provide an accurate but nevertheless speedy reply to your inquiry. I am sorry to hear about your situation but I will endeavour to help you today.
Firstly I am sorry for your loss. That said in essence your mother told you the day before she died that she wanted you to inherit the whole of the house in its entirety but had failed to change her Will to reflect that so the only valid Will is from 2016 and divides the house between yourself and your children is that correct?
I am afraid that as your mother never changed her Will before she died the previous Will stands. I trust this assists
Let me know if you have follow up questions