Who Are "They?"

Along the same line with my expert posts...which really are coming, I promise...I find it interesting that as a new parent, whenever I'm trying to justify something that I'm doing, I refer to "them."  Well, "they" say...  Who are they?  And why do I feel like I need to justify anything?  But I do...and I refer to "them" quite often.  It's a way of putting the onus on someone else.  So, if it's wrong, it wasn't my idea anyway.  I hope everyone enjoys the weekend before the new year really begins come Monday.  Because, you know what "they" say...no, wait, what do "they" say?