i usually don't buy sports games so i can't comment on them, but since he is 50, something oldschool could be nice, in particular if he used to play when was 30.
go with New Super Mario Bros. Wii or Punch-Out!!
a lot of grown up peolpe buy the wii only for wii fit and to stay fit, if it's his case, you should get him Ea Sports Active and/or Ea Sports Active More Wokouts(beware of the second one! some accessories you need to play the game are not included and you should buy them separately, if you don't buy the first game, which has them bundled). I can assure you that they are both really well done and can give you a good workout (thanks to them i lost 5 Kg in 3 Months).
You should also take in consideration Silent Hill: Shattered Memories. while it isn't exactly a "casual game" so at first he may need some advices from you on how to play it, he should like that game. the main charachter is a father, and i believe many of the themes of the game will resonate with a 50 years old father.
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