As he did not have a will, then the estate would pass to the nearest surviving relative under the rules of intestacy.
Unfortunately there's no obligation on the beneficiary of an estate to provide a gravestone for the deceased.
Contributing towards his wealth is not a ground for making a claim under the relevant act - the Inheritance (Provision for Family and Dependants) Act 1975.
Under the Inheritance Act, there are certain categories of people who can make a claim against an estate. These are: spouses, ex spouses (who have not remarried), cohabitees, children, people treated as children and dependants. A spouse will receive an award if the Court decides that they have not received “reasonable provision” from the estate; the other categories will receive an award if they have not received “reasonable maintenance”. In making this decision, the Court will consider a number of key factors set out by the Inheritance Act.
In your case, you aren't going to fall under any of the categories of people who can claim.
The other hurdle would be the fact that he did not provide maintenance for you in the years preceding his untimely passing.
So I'm afraid that it does not look like there are any grounds for you to claim on his estate for financial provision.
I'm sorry that this is the case.
Can I clarify anything further for you today?