Rosaline is Capulet's
niece, as stated in his guest list, which he gave to his illiterate servant and which Romeo read.
"Signior Martino and his wife and daughters; County Anselme and his beauteous sisters; the lady widow of Vitruvio; Signior Placentio and his lovely nieces; Mercutio and his brother Valentine; mine uncle Capulet, his wife, and daughters; my fair niece Rosaline; Livia; Signior Valentio and his cousin Tybalt; Lucio and the lively Helena." (From Act I Scene ii)
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According to the guestlist to Capulet's feast, they are cousins.
Yes Tybalt is a Capulet he is Lord Capulet's nephew.
Tybalt is associated with the Capulets, and he thinks of himself as a Capulet, but he is actually not a Capulet at all. He is the son of Lady Capulet's brother, and Lady Capulet is only a Capulet by marriage. That is why it is Lady Capulet, and not Lord Capulet, who is so furious with Romeo after he kills Tybalt.
He has guaranteed that she will not tell him the truth about her relationship with Romeo, thus sealing her doom.
Lord Capulet has a brother known as second Capulet in the play