<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hi all,

My friend's family live in another city, and his father had been ill for quite some time, terminally so.  In the last new months he'd been in and out of hospital, and for the last few weeks has been staying at home, with much better medication. While he has been ill, he's not had much contact from his side of the family, with only a couple of them seeing him.  Unfortunately he passed away this last week, and my friend has just received a call from his mum, telling him that his dad's sister's husband, who we shall call D and was one of the few who saw him, has claimed that there was a new will drawn up recently, superseding the current will which names my friend and his mother as the main executors, with one that names D as the complete recipient of everything.

Today was the first my friend had heard about his father's will naming him and his mother as executors, and no-one has seen this new will.

The advice my friend and I have given his mother is to have a consultation with a solicitor (Is there a specific type of solicitor it would be best to go see?) and find out about any legal precedent that must be followed with new wills.

My questions are these:
> What's the best course of action for them? (I've recommended agreeing to nothing until all versions of the will are on the table)
> Are there specific lawyers/solicitors for this kind of action?
> Additionally are there any free/low-cost places to go to?
> If there are any details you need to know, please ask, I'll tell what I can, but wont give out anything identifying, also, I'm making this for my friend, so I may need to ask him if I don't know.
<bot>: friend's dad died, dad's brother in law claims new will was made, no-ones seen it, need legal advice.