THIS IS SUCH A FUN QUESTION !!!
In step 1, Kojo speaks English, Korean, and a bit of Mexican Spanish. By step 2, he has added Greek, Mandarin/Chinese, and German! In step 3 he learns Tagalog, French and Italian. He still knows how to speak and read Mexican Spanish, but sometimes he forgets words or his brain just shortcuts when writing ๐๐๐ in step 4 he doesn't learn any new languages ๐
Yu-ming speaks Chinese and English in step 1, but even after already living in the states for 3 years and learning English before moving, she still sometimes forgets simple words like 'microwave' or 'waterbottle' (happens to me but w/ dutch ๐ sigh being bilingual is a blessing and a curse) In step 2 she speaks English better, and has started to learn German for Tammy. In step 3 and 4 it stays like that. Unlike Kojo, Yuming has no desire to learn every language in the world.
(Perhaps they both know Dutch too cuz yeah, but probs not.)