Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first.
Who owns the house you are living in and what income do you each have?
How much is the house worth and how much is outstanding on the mortgage?
How much is he due to inherit?
What is your best guess?
Do you want a divorce?
I have not yet given an answer - sadly I do not type very fast.
I have mixed news for you I am afraid.
On the good side it is unlikely that your ex will be able to force a sale of the property until your granddaughter is 18 or ceases to live with you (or you cohabit)
What happens at that point depends to a great deal on how much he has inherited
The bad news is that he will not be forced to pay you half of his inheritance - BUT the fact that he has that money means that you will get a larger share of the equity in the matrimonial home.
How large a percentage that will be will depend on the amount he receives
At this stage you can issue divorce proceedings based on his Unreasonable Behaviour if you wish to do so - or you can simply wait - the choice is yours
Please ask for any further details that you need