Would it be wrong to not let my ex-husband pick up our daughter today?
Why won't you let your ex-husband pick up your daughter today?
Because he's been drinking and it won't be safe for my daughter to ride with him.
I'm sure it's frustrating to learn that your ex-husband is drinking when he is expected to pick up your daughter. He should not be drinking and expect to drive and pick up your child. Drinking and driving is very dangerous.
In my opinion, if he wants to drink, he doesn't get to see her that day.
I am glad you care so much about your daughter. You're doing the right thing and your ex is being far too careless. You should the authorities know as well how reckless your ex is with driving your daughter.