To me, an intriguing issue is knowing whether these coronavirus circumstances would actually change the day in which my legal obligation for child support is ended.
This is Virginia. The child support order, except in extremely rare cases, is SET by statute. The law doesn't say you owe it until GRADUATION. It says until the child is 19 or "while the child is a full-time high school student."
Again, this boils down to what the district intends to do with the seniors. If they are going to claim that the diploma requirements have been met by what has transpired up until the schools closed (which I suspect is likely in most districts), then the support obligation would appear to end at the day classes stopped. If there is some "full time distance learning" involved, then one might argue the obligation continues until that completes.
Again, absent knowing what the individual district intends to do, we can't give an answer.
My divorce decree specifically states "...child support shall be payable until such time as the Child reaches the age of eighteen (18), does, become married or is otherwise emancipated, unless sooner modified by a court of competent jurisdiction; provided, however, that in the event a Child has attained the age of eighteen (18) and is still a full time high school student residing with the [ex-spouse] then in that event child support shall continue until the child graduates from high school or reaches the age of nineteen (19), whichever event first occurs."
Also, curiously my spouse is a teacher in an adjacent district and she learned that her district will not issue any fourth quarter grades this year. If you're not working toward a grade that pertains to graduation are you still a full time student? The plot thickens...