What do I say?

An uncle of mine recently passed away, who I wasn’t very close with, like this last Saturday. I had invited a lot of my family to my daughters birthday party, which will be this Saturday (previously planned obviously). However, I invited my cousins, who are his daughters and since his passing, I really just wanted to give them their space because I know how overwhelming it might be to have everyone texting them constantly, so I haven’t said anything to her yet. I honestly thought they weren’t going to come to my daughters party but it turns out they’re still planning on coming so I was just wondering if maybe I should give her my condolences in person but also I don’t want to make her emotional in front of everyone.