Tip #1 is make sure that everyone in your family has a properly fitted bike helmet. Once that's done, take a look at everyone's bikes to see if any adjustments need to be made. You may be surprised at how much your kids have grown since last season until they hop on the bike and suddenly they are pedaling with their knees in their armpits!
Last but not least, make sure everyone on the ride is dressed to see and be seen. Throw fashion out the window and opt for bright, neon colors that help drivers see you. For early morning or late afternoon/evening rides, always wear something that reflects light such as reflective tape or markings, or flashing lights. And wear sunglasses or clear bike glasses so that you are not squinting in the wind and sun.
Now that you've got all of that covered, take a look at these bike safety tips from NYC Department of Planning to brush up on things like hand signals, avoiding road hazards, and the safest ways to ride in traffic.