How to find out if my boyfriends parents like me/accept me before I meet them?

So I’m finally meeting my boyfriends parents next week. We’ve been dating for about a year but our relationship has been mostly long distance so this is why I’m just now meeting them. So for the longest time they wet totally against our relationship even though they didn’t know me because I am a few years older than him. He would tell me everything they would say about me to him. When he first told them about me they acted like they were okay and supportive of it then all of sudden it was different and they were always telling him how they didn’t like it. Now that I am about to meet them I am so nervous and stressed about it just because obviously I want them to like me and I’m like nervous about what to talk about with them if they’re going to be judging me and so on. I keep telling my boyfriend to somehow find out how they feel about me but neither of us know how to start that conversation. What are some suggestions?

How to find out if my boyfriends parents like me/accept me before I meet them?
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