Just because he was tested when in your grandma's care doesn't mean he has not manifested a more significant issue as he has become older. Some mental illnesses don't come on until the person is in his 20s. You might just be correct when you write it off to his being a drama king, but 30 is quite late in life to be curled up on the kitchen floor, whining. (Absent taking drugs and having a bad trip). As his sister, I would be moderately on the alert to the possibility that he has a mental condition. At least it will reduce your frustration in thinking he is doing it all on purpose.
Wow I think its time to grow up there guy!!
Oh he is mentally sound. My grandmother did all the testing and stuff on all of my moms kids. He's just an attention seeking drama king. But I thought it was bizarre too. 30 years old and throwing a tantrum that could put my 2 year old to shame.
It's kind of a bizarre story, the lying on the kitchen floor at age 30. Like he is not mentally all there.
I would throw him out...hell get over it.
Sorry its so long. He's been here almost 2 weeks.