That had to have been one the silliest and cutest South Park episodes.Are you sure it isn't this?
Something else on my mind. I got a Christmas card from brother, and inside the envelope was the unopened card we sent to him along with two checks my parents send every month to him. Keep in mind I haven't communicated with him since 1998, since he is severely mentally ill (paranoid schizophrenic) and being the literal genius that he is, is not able to communicate well. I do not know what is trying to say to me, but it is typical of him.
Count your every blessing if none of your parents or siblings are not born mentally ill; it can be very trying, upsetting and stressful, doubly so when said sibling refuses to be treated with medication that is very effective, family help or therapy.