DD (3 in a couple of weeks) is Dutch/English bilingual. Her dad is Dutch, and spends a lot of time with her, taking responsibility for childcare one day a week. He speaks only Dutch with her, and reads books in Dutch etc. They also hang out with Dutch friends.
Her understanding of both languages is equal but as you can imagine she mostly speaks English. She does understand there are two languages at home, but because I understand Dutch well and we often have conversations where I speak English and he speaks Dutch, she's had no reason to figure it out until we started to tell her!
Her Dutch grandparents speak no English, and are visiting for a week over Christmas. This is the first time they have seen her for a while, certainly since her language has taken a huge spurt. We've explained to her that Oma and Opa speak Dutch, and that sometimes they may not understand her. This is sparking a bit of anxiety though, and now she says she doesn't want them to come!
Any stories to share about similar situations. I expect these early frustrations are common...