No.
Originally, the developers at Nintendo had intended for the two to be related, but eventually decided against it. This can easily be seen by common physical traits between the two and between Peach and Rosalina's mother, as seen within the storybook of Super Mario Galaxy.
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princess peach
No, Rosalina and peach are sisters. Daisy is peaches cousin.
yes they are sisters
Princess peach does not have a sister, Princess Daisy is in fact another princess from Sarasaraland. In early concepts Princess Rosalina was meant to be Princess's Peach's sister but the idea was scrapped
No one. But she likes Mario. However, she does not like Mario's girlfriend, Princess Peach.