If I can give an advice to the OP, STAY IN THE US!
Things Aviation speaking are working out over there, get a CFI and build some hours. They need CFIs so bad at the moment.
There are no jobs in Brazil right now, I fly in Suriname and we get a ton of application from Brazilian pilots looking for jobs, all rejected due to their lack of English proficiency. When I go to the North and North east every single aeroclube has Instructors siting around that just can't leave the place or get an other job.
It will take you so much time to get all the papers done that you will start hating Brazil, trust me, work in the US and go to Brazil on holiday.
Being married to a Brazilian doesn't mean much, you have the same rights of somebody with an Uniao Estavel, immigration speaking.
If you wanna apply for an RNE do it from abroad!!! times will be shorter, visit the forum on Gringoes and you will have an idea of what you need, but again I would stay in the US.