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I will say that siblingship tests are also done by a lot of companies, but results are not as clear cut and cannot give a definite yes/no answer. They give what is probable, likely, looks like, etc. The results involve percentages and are not as cut and dry as say a paternity test. One of the reasons people use them is they have an option to be done as a chain of custody test. A chain of custody test just means that you went to a collection site and showed ID to prove you took the test. This puts results in the position to be accepted by courts. This test can also be done at home, but this way has no way to prove who provided the samples.
In sibling tests, unfavorable results don't necessarily mean that you are not siblings. It just depends on what DNA was examined and what the sample taken yielded. The results are also sometimes not favorable if only the siblings or half siblings participated. The results have the odds of being much better if the mother of the siblings or mothers of the half siblings participate. The next best scenario is if one mother of the two half siblings participated with the half siblings.
I have heard that people will do something like the Family Finder Test with Family Tree DNA before doing a siblingship test. However, keep in mind that the Family Finder Test is not something one can use for child support, court, and legal things, but may open more doors to other relatives other than even siblings.