Did you mean New Super Mario Bros.? Yoshi isn't in that, but he is playable in Super Mario 64 DS, and you can ride him in New Super Mario Bros. Wii!
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no yoshi is not even in the game
13 Yoshi games 2 unreleashed games [Super Mario Galaxy 2 and new Super Mario bros for the Wii]
With Baby Mario, you press y button.
Not exactly siblings. In several of the games that Yoshi is in, he has different colors of his own kind (like in Mario Super Sluggers, or in the party in Mario Galaxy). In Super Sluggers, there were also different "Toads", also. Not really clear if Yoshi has siblings, but there are different Yoshi's.
No.