I've been around a number of people who grew up speaking multiple languages, however, they were already preteens-adults by the time I met them. There were some obvious generalizations that could be made. For instance, if the second language was spoken at home by both parents the kids spoke better (and if there was extended family nearby than there were even more apt to use their second language often). Kids that had parents that spoke different languages  were sort of a mixed bag but it depended A LOT on how much the parent that was the speaker of the second (or third) language was tied to their culture (for instance, if they went to a church in that second language or talked often with family etc). It also made a big difference if the other parent was supportive or not (for instance, I knew one father who would get upset if the mom spoke to the children in her native language because he couldn't understand it).Â
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So taking that all in mind I was really interested in what DD's language development would be like. Both DH and I are very much on board with her being bilingual and we both speak the other's language so when we speak to each other it's a mix of the two. DH used to speak to DD only in his native language and I would just speak to her in English. However, that's changed since we recently moved to Brazil (where DH is from) so now we both speak to her in English since she can easily learn Portuguese from relatives/school etc and she also hears us speaking it whenever we leave the house. We do, however, restrict TV to just English for now.
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Ok, so that's the background of our family. What I've been so fascinated with is how she learns the two different languages. I knew there would be some words that she'd learn in English or Portuguese first (probably because they were easier to say in their respective language) but what I wasn't prepared for was for her grammar to be at completely different levels in the two languages. In English she has a much, much richer vocabulary. She can have long conversations with me and ask questions but her grammar is still very much toddler like. She pretty much never uses verbs and it's more like she smashes a bunch of nouns together to make a sentence. We also get what she's saying but it's not eloquent (very cute but you know what I mean). In Portuguese it's really different. She speaks very grammatically correct, she can conjugate the verbs and everything! But her vocabulary is pretty small and if she's speaking to friends sometimes she'll come over to myself or DH to translate stuff for her. I'm really confused by this difference with the grammar...
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Has anyone else experience something similar? FWIW, I posted here before because DD was on the slower end of creating sentences in respect to her vocabulary itself so she's always had a bit of an odd language development. Mostly, I'm just curious because I find language development pretty fascinating. :) I also wonder if it will be similar in the next kid...
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Oh, and one last thing and I'll stop bothering everyone here... has anybody had problems with relatives who were really confused by the bilingual thing? DH's relatives keep going on and on about DD having an accent in Portuguese but that's not the case at all! Instead, she's normally asking for whatever it is in English instead (many words are just pronounced different but the words are pretty much the same) so it has nothing to do with her accent! On top of that DH's grandpa actually yelled at DD (not as in he was upset at more but out of frustration from not understanding her) because of something like that. I get it's hard for them because they don't speak English but DD's 2 it's not like she knows all the words in both languages and can communicate everything effectively all the time either...















.  You're definitely right about personality affecting language development quite a bit. That family that I mentioned in the OP where the mom didn't speak her native language with her kids because her DH got upset, well, there was one kid who really was interested in learning English and he put in so much effort it was really amazing! However, he had a little brother who just showed no interest at all and prefered German, so I definitely get what you're saying. 
). In general, she still shows a clear preference for English (for certain books/discussions DH will ask what languages she wants him to speak in and she always says English).



