The family left at noon which is 12:00.
Add 4 hours for the trip.
Add 1 hour for lunch.
Add 2 hours for the amusement park.
That's 7 hours after 12:00 or 7:00.
If you don't understand, I suggest examining a clock.
[tex]\sf\ Answer:\ {\boxed{\sf\ 7\sf\ P.M.}[/tex]