Zelda, you and I sound similar in this respect. I tend to BITE MY TOUNGE when I have such an impulse, but sometimes I STILL "ramble". I STILL get ignored, etc.... Still, I have been on the receiving end of such things, sometimes from the SAME people that complain if I do it.
Try to hold it in a bit.
As for the laughter? I do THAT also. I really try to hold that in. But I DO sometimes crack a smile, and maybe laugh a LITTLE. Still, you can hold that back.
If ypur sister likes twilight, maybe SHE will be more interested.
Your fsther might not like it anyway.