If You Get A 2nd Remote For Wii, Does That Mean That You Play Each Other In The Wii Sports?

You can play against each other in tennis  with 2 remotes. You are on one side of the screen and your opponent is on the other. With bowling or golf, you can play with any # of players with any# of wiimotes

Hi bussy!
With the two Wii remotes, 2 players can play tennis one on each side of the ground. Such games are not played with single remotes For more details click on the link:
Wii remotes

Yes. You can have 2 people on tennis, 2 on boxing, 4 on bowling (I think that's the max), 2 on baseball, and idk about golf, I think it's the same number as bowling.