Bank account in different name

My father passed away on Tuesday and I'm trying to organise getting his bank account to pay for the funeral and the finals bills.

I'm 23 and pretty broke so I can't pay for any of this stuff myself, at the moment the funeral is on my credit card.

The deal is he used a different name than his birth name for all banking reasons, and did not have a will that I know of. I've called all the lawyers I know he has had and none of them have one. How would I go about getting a bank to release his bank account to me, when the name on the death certificate is different to the name on the accounts. He did have his disability pension paid into the account, his pension was under his real name but payed into the account with the different name.

Also, I have a half sister we haven't heard from in over 10 years, I don't know her last name and have only met her like twice (has a different last name to my father, I have a different last name too). I have absolutely no way to contact her, how would this impact his estate?

I'm pretty lost at the moment and don't know where to go, so any advice would be amazing.

For the funeral expenses - talk to some local directors - explain that there are funds in the estate but you are not able to access them and ask if they can either hold the bill for payment later.