Well, I figured that I would post about the abbreviations I use for those who may not know for sure. I'm going to try to be exhaustive here, but if I leave some out, let me know and I will add it.
Sis-My Older Sister
BiL-Brother in Law (Sis' husband)
YS-My Younger Sister
YSB-Younger Sister's Boyfriend
Howard-My 2nd oldest nephew; Sis & BiL's oldest child
Sunscreen-My youngest nephew; Sis & BiL's youngest child.
YOB-Younger Older Brother
I think that's it; at least for the common abbreviations...Any questions, just let me know and I will try my best to answer.