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As a Finn, I think that Mikael, Helinä, Elisabet and Emilia could be an actual Finnish sibset. Elisabet stands out a bit, though: it's normally used as a middle name, while Liisa, Elisa and Elsa are more common as first names. If they're a Finnish-Swedish sibset, then Helinä is a bit weird: you could change it to Helena. Also, Emilia is a bit more modern than the other names: it's been quite popular from 1980's to the current day, while Elisabet, Helinä and Helena were more popular during the first half of the 20th century. Mikael is pretty much like Michael in the English-speaking countries, that is it has been very popular throughout the last century.

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Caspar, Olivia, Lovisa or Viola seems very believable to me, too. I'm not sure about the situation in Sweden, but at least in Finland Viola has been slightly more common than Lovisa (or Loviisa) in recent years. Also, Casper is more Swedish form, but Caspar will do just fine.