Could undiscovered sister stars be hiding in our Oort cloud?

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Hipparcus indicates that our supposed closest star alpha centuari is 742 marcs parallax, which corresponds to about 1.3 pc or 4.3 yrs away. Since stars form in multiple; hence our sun has sister stars at much closer distance, with higher parallax values. Also infrared telescope could be used to look for cold gas giants, and compare image size for relative closesness. In fact does the Brown dwarf survey, and other surveys, include some large infrared planets which indicate a nearby sister star? Such sister stars would have a center of mass, and hence via central force, one would have a spherical distributed cometary cloud - a common Oort cloud. So does our Oort cloud enclose a multi-stellar system?
 
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cph said:
Hipparcus indicates that our supposed closest star alpha centuari is 742 marcs parallax, which corresponds to about 1.3 pc or 4.3 yrs away.

So far so good.

cph said:
Since stars form in multiple;

Sometimes.

cph said:
hence our sun has sister stars at much closer distance, with higher parallax values.

This doesn't logically follow. Observationally, it appears to be untrue.

cph said:
Also infrared telescope could be used to look for cold gas giants, and compare image size for relative closesness.

Yes, but a gas giant is not a star.

cph said:
In fact does the Brown dwarf survey, and other surveys, include some large infrared planets which indicate a nearby sister star?

No.

cph said:
Such sister stars would have a center of mass, and hence via central force, one would have a spherical distributed cometary cloud - a common Oort cloud. So does our Oort cloud enclose a multi-stellar system?

And no.
 
Uh, IIRC, the infrared survey results are not all in. However, no obvious candidates for red or brown dwarf stars have yet jumped out of the search. There may be ultra-dim stars, there may be ice-planets, but they'll take some finding and much confirmation.

Odds are good on lots of 'plutoid' objects, and possibly a couple of distant 'neptunians'. IMHO, finding 'Nemesis' is unlikely...