Wedding guests dress help

Hey y’all so I’m going to my boyfriends uncles wedding in 2 weeks and I still have no idea what i’m gonna wear and I’m in a little bit of a panic cause it’ll be my first time meeting my boyfriends extended family and I want to make a good impression, for reference the wedding will be in a synagogue early in the afternoon and the reception I believe will be at a golf course. I asked my boyfriends mom for a little help and she said it’s not fancy at to just wear something I’d go to church in, but my boyfriend is going in a nice suit and we want to match a little or at least have our outfits complement each other. and his suit is grey and now i’m just lost ☹️

Picture of boyfriends suit (he’s gonna wear a different tie to match me)