I think it is a good idea to be a missionary.  First, it is a good idea for families because kids can have fun.  You can reach other families by your children.  Families can also have more time together and have fun together serving God.  Second, you can help people get saved because the people can believe in God when they hear about Him.  They might become a missionary too, and they can hear the Gospel.  I think you should be a missionary.