If you have children together, be sure to make a note on the calendar of every night the children stay with you, or with your ex.
As mentioned here recently, the Google calendar facility is very easy to use and you don’t have to look at it all the time. You can deselect it from everyday view, then it won’t act as a constant reminder of any angst you may be suffering but it’s easy enough to access when you need to update it.
It may seem completely unnecessary, particularly if everything is running along amicably between you and your ex, however, the nicest of worms can complete the bizarrest of u-turns and on the topic of your children, it is better to be safe than sorry.
If child-benefit related authorities get involved, they will want a detailed account of who stayed where and you may also have to provide details to the solicitors too.