Not an overstay yet. Dec 3 is the last date ...we were thibking of extension as my sibling travels with parents who are on GC and have a language,age,health barrier, both touching 70. They are a big help in the travel process, flight delays, luggage moving, going anywhere while in USA. My parents have a house they help with thr house stuff in this old age, dox appointments n what not. So they being along my parents is a real help which is why we were thinking to extend.
Also my sibling does not plan to over stay or take extension if this goes against the immigration laws.