He didn’t blame her – if he’d had a sister like that ...
I came across this
sentence written by a native English speaker.

He didn’t blame her – if he’d had a sister like that ...

I just thought it should be "wouldn't" at the "didn't".

Is this kinda a common mistake or the speaker was sure enough that
he wouldn't do it that he said "didn't" instead of "wouldn't"?

Thank you!

Question

He didn’t blame her – if he’d had a sister like that ...
I came across this
sentence written by a native English speaker.

He didn’t blame her – if he’d had a sister like that ...

I just thought it should be "wouldn't" at the "didn't".

Is this kinda a common mistake or the speaker was sure enough that
he wouldn't do it that he said "didn't" instead of "wouldn't"?

Thank you!

Answer

As I read it, the first part of the sentence is just a statement of past fact and not part of the conditional bit which follows. Presumably the person continued with the conditional part of the sentence with a 'would/would have' type construction.
e.g. "If he'd had a sister like that, he WOULD HAVE ...."

Answer

It's correct.

"I wouldn't blame you if you did that" means the person hasn't done the action yet, they are thinking about it.

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