The gift was made via a bank transfer to my account after the sale of my parents house. The gift was from both my parents, although I'm not 100% sure if it was transferred from their joint account or my mums sole account.
I had various email correspondance with a financial advisor that my parents and I also met in person that can also confirm their intentions.
My father's view is that I am entitled to the money and is equally distressed and upset at my mums sudden changes in mental state.
There is probably some email correspondance from my parents that may refer to inheritance and gift but nothing formal. Every other member of the family and friends know that it was my inheritance. There are emails from the financial advisor describing how inheritance works as PET for the sum of £420,000. Probably from my parents as well as myself.
There is no formal deed though.
Yes we have bought a house with the money and have been living next door to them for the last 9 months - which has caused some of the relationship issues.
The solicitor that dealt with our house purchase also knows about the situation and inheritance that was coming from my parents to purchase our house.
In this instance would it be an affidavit that I would get my father to sign in front of a solicitor?
Also in the instance that my mother was to change her mind and be willing to make the inheritance official, would there be a way of issuing a deed retrospectively or another simpler way of making it legal?