Whilst it won't be possible to fully eliminate condensation you can take a few steps to reduce the condensation in your tent.

Ventilation - By far the best way to reduce condensation in your tent is to ensure the tent is well ventilated, make sure any vents are open, many family tents will have mesh doors which can allow for increased airflow whilst keeping insects out.

Don't cook in your tent - Cooking in your tent can be dangerous but can also increase the amount moisture in the air and increasing condensation in your tent.

Don't store wet clothing or footwear in your tent - Keep these items seperate, an awning or tarp can be a good place to keep the moisture out of your tent