>>508971228 (OP)There are two types of brown eyed person:
Those who have 50% chance of having blue eye babies with a blue eyed partner and the rest of brown eyed who can't have blue eyed babies (asians, south americans, african, south europeans).
You just have to check if that brown eyed person has one parent with blue eye.
You can raise the probability to 100% if you go to a specialized clinic in some countries like US, mexico and thailand (cost $10k-15k).