How to say " Come here please "
I'm constantly trying to get my brother to come, and he never listens. So now I'm going to confuse him a little bit. Maybe he will come then ? 
6 Answers
For a brother I'd use the familiar: Ven acá, por favor.
My husband is always yelling "Ven, ven, nena, ven!" or "Venga aca, por favor!" and on occassion "Ven aqui"
I thought only cats behaved like that.
Once bitten, twice shy!
What happened the last time he came to you? You put him to bed? Gave him a bath? Kids learn to avoid behavior that results in negative reinforcement. Treat him like any other animal: bribe him with a treat. I'm assuming that he's your younger brother.
If you're just talking about the typical sibling love/hate relationship then rat him out to your parents like every other sibling does.
Mom, Johnny won't.....!
You are right, Kevin, it should be informal, thus:
¡Ven aquí, por favor!
¡Venga aqui, por favor! Hope it works! 
Another option if you want to use the "vos":
¡Vení para acá!
Have fun with your brother!!!
