Ex husband relapsed.

My ex husband and I share custody.70-30 (court order) he had them this weekend and he ended up relapsing and calling me to pick up the kids. I've barely talked to him. I have reached out to attorney and they couldn't give me much advice besides go back to court and I dont have the money for that. Im trying to be civil with him about this. What are my rights to the children during this time? If he asks to be with them? My kids love their father as much as I dislike him and the toxic relationship we had. Just not sure if I can tell him he can't have them overnights or see them until he's sober or gets helps. Idk. Our decree states that he has to participate in and finish all steps in his rehab and show proof. Well that happened already and then 3 months later did this. Does that still mean the same for this too?