Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How much does he owe her in total - and is there any record of their agreement?
Yes I am a solicitor in the East Midlands.
Did they both sign this?
Your granddaughter can sue her "friend" for the full amount outstanding using the Money Claim online service here
The Judgement that she obtains can then be enforced afainst hi if need be
Please do not hesitate to ask for any further details that you need
No it is just a breach of contract