Learn what "my sister was" means, when people say it, and how to use it naturally in English.

This means the speaker thinks their sister was not effective at keeping or defending her own things.
From The Billionaire’S Vow, Episode 4
The speaker says their sister was never good at protecting what belongs to her.
Use it when talking about someone's ability to protect their interests or possessions. It is fairly specific and not a common phrase search.
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