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When you return home, the normal exchange is:

(oneself): "タダイマ"  
(family member at your residence): "オカエリ"

My interpretation is that "タダイマ" means " _hey, I've just got home._ ". And,
"オカエリ" means " _welcome home!_ ".

So, it would just sound weird to say "タダイマ" if someone beats you to the punch
and says "オカエリ" to you?
CC BY-SA 3.0
2017-01-23T23:01:03.853
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2017-01-24T23:39:44.500
2017-01-24T23:39:44.500
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set-phrases
Does it sound unnatural to say "タダイマ" after someone says "オカエリ" to you?
No, it wouldn't sound weird at all. It's perfectly fine and natural to say
ただいま after someone says おかえり to you.
CC BY-SA 3.0
2017-01-23T23:13:52.733
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2017-01-23T23:13:52.733
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answer