Sons name on tombstone

Hi, my name is Anthony. A year and a half ago I lost my only child he was my everything and luckily my aunt and uncle had room at their plot for us to bury him. But I just can’t come up with the money to get his name but on the tombstone. I work 7 days a week darling the summer but with his death I took on helping his wife and my granddaughter they now live with me and my wife and there is not even a penny to spare. I go every Sunday to spend time at his grave and it kills me not to see his name on it. So if you can help just a little bit I would be every thankful. God bless