My foster son's father died...

I've made a few post on here that were mainly centered around my foster son and my two sons who are 17 and 18. Quick update with that, my sons are volunteering with Red Cross for thw bullying, but they seem to be getting along now. When my foster son had a bad dream my sons stayed up to play cards against humanity with him.

Now my foster son didn't have the best life. His mom passed away and all he has left from her is an Elmo plush she gave him as a kid and it's why he carries it around. He gets embarrassed about it because hes 15 now so he will carry it in a backpack. After his mom died it was just him and his dad who was an alcoholic and junkie. His dad would be strung out and his dad's friends molested on my foster son. He was taken away and put into cps custody and we are his 5th home. His father comes to visitation every 2 weeks and calls him. His dad actually seemed to be getting sober and was trying really hard to get him back. His caseworker came by today and told me and my husband that his dad relapsed and overdosed on meth and died... That was devastating. I sent my boys to do something outside so we could talk to him privately. My foster son asked what was going on and hus caseworker said they needed to talk to him. First thing he said was "Is my dad ok?" She didn't answer and he started to panic and asked again. She said "I'm so sorry. He relapsed and." Then my foster son ran out the door. My husband ran after him. My husband caught up to him and pulled him into a hug while he just cried and started screaming that he has nobody left. He's been laying on the couch in the living room wanted to be left alone hugging his Elmo and I made sure my sons knew to leave him alone. My 17 year old left him a piece of cake from dessert I made after dinner but My foster son didn't eat it or eat anything. He is hurting so bad and I know I cant stop the hurt but how can I make it hurt less?💔

Edit: If we were to adopt him that would have to be a family discussion first, plus... After his dad JUST died and he thought he would eventually end up back home I think bring up adoption RN isn't the best idea.