Over time, a series of subtle events that amount to a substantial change may occur that could be helpful for your custody case. However, the fine details, dates and time will be forgotten over time. The key is to keep a journal and write out what happened that was not in the child’s best interests, with the time and date of the entry. This can be used at trial in a variety of ways, such as to refresh your recollection. This evidence can make your case.