One month, several hands
A family calendar sits where more than one person can reach it. Large numerals are easier to read from a few feet away. The A, B, and C rows are empty tracks. They are not a scoring system. Label them in the margin if you want Mom, Dad, and kids, or leave them as three lines for anyone to grab.
Sunday start is the default because many U.S. household wall calendars start there. Monday start is one control away. Adjacent days from other months stay off, so the wall is not noisy. Optional holiday marks can remind a household about Thanksgiving or Independence Day; they remain approximate.
If the household needs hours, print a weekly planner for the busy week and keep this month on the wall as the overview. A student homework week is a better desk sheet for one child than a shared wall month.
Print in portrait on Letter. High contrast helps if the calendar hangs in a dim hallway. Rust accent only colors the title, so the day cells stay writable. Avoid a dark full-page background; this template does not use one, and a heavy fill would waste toner.
Event fields can mark a birthday or a game day in the cell. Keep those labels short so they do not collide with the handwriting rows.