Here’s some caselaw (from 2010) about hosting parties where minors have access to alcohol and drink it.
In this case, they hosted a party for their daughter, where a bunch of kids were drinking, and they were aware the kids were drinking.
If the Legislature wishes to criminalize the knowing passive hosting of parties at which alcohol is served to minors, it certainly may and probably ought to do so.”
People v. Heil, 28 Misc. 3d 215, 224, 900 N.Y.S.2d 624, 631 (City Ct. 2010)
This accords with a NYS appellate court from 2006 which stated that “t is thus clear that any offense contemplated under section 65 is directed against commercial vendors and distributors of intoxicants and not against individuals in their own homes”. People v. Taxin, 11 Misc. 3d 45, 46, 812 N.Y.S.2d 224, 225 (App. Term 2006). But see People v. Himmel 252 A.D.2d 273 (App. Term 1999) (defendant was liable for providing alcohol to minor in his own home, where he also raped her afterward).