Can I confront without evidence? Relapse

Hello,

I'll just jump right in: 2ish years ago my then bf was drinking heavily, some shit went down (no cheating but lying and secrets) and it got worse after our first child was born. He got help (we have been going to couples counseling as well) and has been sober since our daughter was about 2 months old.

We got pregnant with our second child, got engaged and moved within the last 3 years. A lot of potential stressors, I get it. Fast forward to September, literally 2 weeks after our son is born. I said something to my sister (who we live with) about him being super stressed out and possibly depressed because he's always "tired" or "not feeling well" and laying in bed. My sister told me she didn't have proof and didn't want to say anything but she was pretty sure he had been drinking her alcohol. She doesn't drink very often or very much at all but she had noticed the odd time she'd grab her alcohol, there would be more missing than what she thought she drank.

I kind of just brushed it off and said I would know if he was drinking again, but I felt it in my heart he was. We moved on.

Last night we were all out and he brought my daughter home early because she was tired and fussy. The event ended earlier than we thought it would and when i got back, he seemed shocked we were home so early and he chugged the glass of OJ he was drinking, rinsed the glass really well and went upstairs and basically avoided me the rest of the night. Then I noticed there was a whisky bottle on the counter.

Not wanting to just jump to conclusions and lose my mind, I asked my sister and mother (also lives with us) if they had taken it out. My mother said it's hers and yes she did take it out because she was going to bring it on her trip, but she's pissed because there seems to be a lot missing from it. And it's not where she left it after she took it out.

So now I'm 99% sure he's drinking again and trying to hide it. But I have no concrete proof since I haven't caught him.

I honestly had no reason to believe he was drinking again until last night and it just seemed so odd. I want to trust him, but I just have a gut feeling I already know what he's doing.

Do I ask him with no evidence? If he says he's not I have no reason to not believe him other than my feelings. What would you do?

Sorry this was so long. If you made it this far, thank you for reading.