Which documents to list in AP1 section 5?

Father owned property in his sole name. He died, his will passed the property to his spouse (my mother), but the change of ownership to her was never made to Land Registry. Mother died, without a will.
The property has passed to me & sibling. We have a Letter of Administration for her estate. For section 5 of the AP1 do I need to include: E-copy of registration of the property owned by my father. A copy of His will.The letter of Administration for my mother's estate. verified ID3 form.
Will that be sufficient to demonstrate the lineage of the ownership of the property, or is there other documents that are required?

For section 14 of the AP1, Evidence of identity of the transferor - this would be my deceased father. Do I need to provide evidence of identity for him? I do not have his passport.

Felciia - when a sole legal owner dies the property forms part of his estate. Probate or Letters of Administration are then needed to enable his executor/administrator to deal with the property. If that does not happen then the property remains as part of his estate
If he left the property to your late Mother, and she has now died, you can consider a 'chain of representation' but only if probate/letters of administration were obtained for your late Father. If they were not then that is usually your next step as the property remains part of his estate.
We don't need sight of the wills on submission. And any transfer of the legal ownership will be by the executor/administrator so you would need ID3 for he/she and/ the new owner as appropriate
The first thing to do is to check if probate/letters of administration were obtained for your late Father and then work forward from there