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 is the property worth and how much is outstanding on the mortgage?
How long have you lived together and are there any children involved?
Why did your father in law retain ownership
What was the purchase price?
What income do you and your ex each have?
What settlement have you been offered?
What documentation do you have about the "gift" given that in fact what he did was purchase the house in his own name
What is your ex likely to say?
Will he confirm that the agreement was that the house would be yours if you paid the mortgage
How much will you need to rehouse yourself and the children?
The fact that you and your husband have paid the mortgage all these years on the promise that the house would be yours does raise the possibility of a claim of
"proprietary estoppel" regarding your interest in the property.
This means that you and your husband could well have a good claim in respect of the increase in equity that has accrued since you moved in.
Your claim on the "gift" it more tenuous since there is actually no evidence that it was a gift - given that he kept the property in his own name.
However there is certainly enough in what you can prove to make some sort of settlement possible - and £50,000 may well be achievable.
I hope that this is of assistance - please ask if you need further details