tiny question bugging me...

I just have a tiny question that perhaps some of you can answer... When Wilbur makes his first suicide attempt with the gas, his brother Harbour receives a phone call, and then rushes off immediately to save Wilbur. Who could've phoned him? And if anyone knew what was going on, why didn't they break into Wilbur's house themselves to rescue him??

If someone was worried because of the smell of gas, why would they call Harbour instead of just checking up? The fact that it was Harbour that got the call implies that there was someone who knew what was going on AND knew that Harbour was Wilbur's brother (otherwise, why call him in the first place)?

Perhaps I missed a very simple explanation, as I was watching the film while also, from time to time, having to entertain my 12-week-old kitten, but still...

At first, I thought the film had no more to offer than a gorgeous art direction, some nice acting and a few interesting ideas, but after reading some posts here about the whole "Harbour/Wilbur" identity shift, I have to say there is more narrative power to it than I suspected at first. But such a small thing like that phone call (which isn't small at all ofcourse, but essential) does bug me, because it confirms my initial opinion about the weakness of the script.

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These games are being degraded by the increasing use of professional tricks to stay alive!