It was all I could do to keep myself in stern parent mode, and prevent myself from smiling. Allow me to translate:
Papai I'm sorry please I want to go back.
The thing that's so funny about it for me is that even though he only spelled one word correctly, it's pretty close using the Portuguese pronunciation of the letters. He's got this idea that sentences need to start with as well as end with a period, and I've been trying to dissuade him of this misconception, but he says that's what the teacher told him so I'm not sure why I waste my breath on the subject.
In case you're curious, yesterday was Brazilian independence day, and I got mad because Lucas was misbehaving on the trampoline, so I dragged him away from the parade and told him we wouldn't go back. We eventually did go back, but the parade was over by then.