If my brother died and was Mexican but an American resident; there is the possibility of going for his remains to Seatlee I live in Cdmx

My name is the coroner and your body will be cremated these days they will agree; funeral and consulate

It depends on how he arranged his funeral. If he did not, it is likely. You have to come to Seattle and also contact the municipal police where your brother was a resident to ensure custody of his remains.