How do I cash an escrow check that’s made out to my deceased parents

There is no will and there is no estate. Back in 2014 my dad became terminally ill. At that time he transferred his home to me and he became the life estate. He passed later that year. The deed is in my name as are the taxes. The mortgage on the property remained is his name and my mothers name who is also deceased. I sold the house on September 27th of this year . I had an escrow balance of 4200 dollars. I am also the successor of this mortgage. The mortgage company issued a refund check in both my parents name and I’m not able to deposit it into my account. What are my options?