Actually, I've heard your version, 我每天.... much more than the translation at the top. Your version sounds much more natural. Your instincts are right!

From the standpoint of an ABC and someone who lived in Shanghai for 6 years, yes. Generally the entire subject goes first in a sentence. Otherwise it sounds unnaturally burdensome.

每天 is put here correctly in my opinion bc 我和我妹妹 (me and my sister) this whole part is just the subjet, and as u all know chinese goes by SVO (subject + verb + object), so in this sentence: subject：我和我（的）妹妹；verb：玩；and object：乒乓球, simple as that :)

每天 is put here correctly in my opinion bc 我和我妹妹 (me and my sister) this whole part is just the subjet, and as u all know chinese goes by SVO (subject + verb + object), so in this sentence: subject：我和我（的）妹妹；verb：玩；and object：乒乓球, simple as that :)

I was taught that close family members don't require the '的', but this course seems to be hit and miss so far.

No. I've even had Chinese people correct me on that before, it's more natural without .

no. You can even say 我妹 which is much more natural.

I agree, I have never heard 玩乒乓球, only 打 But I am also not a native speaker, and I haven't spent a lot of time 打乒乓球 :P

Yes, in fact native speakers never use "玩" like this. I play table tennis with Chinese people every day and they will look at you strange of you say this. "玩" is used for playing video games, board games, etc. ("玩游戏"). In this case "打乒乓球" is correct and even DL teaches it that way in an early lesson. Perhaps DL is trying to show the literal English translation here, but people don't say this.

it is needed. 乒乓球 = table tennis

I don't think so? https://resources.allsetlearning.com/chinese/grammar/Chinese_word_order#Placement_of_target_in_a_sentence

都可以。。有相同的意思。。