Just FYI, anybody can file an extension for any reason for anybody since it's an unsigned form. You can get the 4868 right off the IRS website along with the instructions and as you will see at no point does anyone have to sign the form.
However if you expect to have a balance due on the 1040 when it is eventually filed an estimated payment should be sent with the form 4868 and filed by April 18th 2023.
