If only in regards to our sun's past, we'll have answers. As for the siblings, yes who knows if we'll find them... there may not be many.

Great paper with basic backgrounds on star formations (love the HII idea).

Chondrites and the Protoplanetary Disk
ASP Conference Series, Vol. 341, 2005*
A.N. Krot, E.R.D. Scott, & B.Reipurth, eds.

Understanding Our Origins: Star Formation in H II Region Environments.

[The strongest evidence that the Sun formed near a massive star comes from analysis of the decay products of SLRs in meteorites. Studies of SLRs in meteorites date back to the discovery of evidence that live Al was present in the young Solar System (Lee, Papanastassiou, & Wasserburg 1976). A variety of ideas have been put forward for the origin of SLRs in meteorites. These include the idea, going back to Cameron & Truran (1977), that formation of the Sun might have been triggered by a nearby supernova which also mixed newly synthesized isotopes in to the material from which the Sun formed. This idea has recently been considered in detail by Goswami & Vanhala (2000).]

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[Tachibana & Huss (2003) reported the confirmation of live 60Fe in the early Solar System. 60Fe, which has a half –life of 1.5 myr, is a neutron-rich isotope that is not formed in abundance by spallation reactions (Lee et al. 1998), but is formed in core collapse supernovae. The presence of this neutron-rich isotope is compelling evidence for an interstellar origin for at least some SLRs. ]

[We conclude that 60Fe has replaced 10Be as a new and unambiguous “smoking gun” that places the Sun’s formation in a rich cluster environment near at least one massive star.]

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http://eagle.la.asu.edu/hester/star_formation/hester_kauai_published.pdf

Stars such as our sun... metal rich/2nd generation, having a large number of (varied) planets may be a rare occurence.