I've been separated from my ex hubby for nearly 5 yrs now and been divorced from my ex hubby for 3 yrs. We had 3 children together. I now have a new partner (I've been with him 4yrs) my youngest son from my ex hubby has not had contact with his dad for over a year because of an incident involving him and his dad. He has said he doesn't want to see his dad again. My partner would love to adopt him as they are very close. My ex leaves him out all the time now doesn't buy him anything and doesn't
Try to contact him. Would my partner stand a chance of adopting my son

Your partner, if you two are in the US, would have to be married to you and for even as longer as a year, depending on your state's laws. If you are in another country, please check into its laws for adoption requirements.