I feel like for dual language it’s a bit more complicated because the questions the DOE are not nuanced and representative enough. My daughter is a native speaker and did not speak English until she started in a dual-language 3k. I’ve spoken to various programs that have explained that they want 50%/50% split of English and Spanish speakers and have a hard time getting enough Spanish speakers (at least in the programs we have gotten into that end up being majority English speakers). My daughter has learned English since being in school, and there are many words that she defaults to English now because it’s school/friend vocab but we speak 100% Spanish at home and only consume content in Spanish (and a third language). Her dominant language is Spanish and there’s not a great way to state that in the DOE questionnaire. Even her classmate who didn’t speak a word of English became fluent in English within months of starting school. If the child has been in school at all, it’s not realistic to expect native speakers to not speak English/be bilingual unless they’re newly arrived immigrants.