Colin Rosenstiel wrote:

nationalrail.co.uk gives an off peak day travelcard fare of £81.60, so
£101.60 all-in if you have no Network Card and you can use it for the
rest of the year for discounted off-peak rail travel in the South East.

Good point. It's often forgotten that the Network Railcard has almost
all of the same properties as the Family Railcard (other than that
adult(s) with no children are an acceptable group, and the gbp10
minimum fare), and might be a better choice for those who will travel
with their family as a one-off then use it themselves afterwards.

Neil