I think it has to do with the fact that the lines between the languages became very blurry in my mind. My wife and I always switch between Portuguese/German/English in the same conversation…
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Ah. We made it a point to only speak English at home and let kids absorb Japanese elsewhere (grandparents, kindergarten, out and about). To my surprise it wasn’t difficult for my oldest who is 5 now. He still applies some Japanese language structure to English and I correct him when he does and he learns it pretty fast.
It must be hard for kids to figure out 3 languages 😆
I have a cousins who know German, English, and Italian and they seem to be alright.