It is two in the morning and you are staring at a calendar, trying to figure out how to tell your ex that you need to swap weekends without starting a fight. The schedule looked fine when you wrote it. Then a work trip landed on your weekend, a child got sick on theirs, a wedding invitation arrived with three weeks' notice, and every change turned into the same argument about who asks, who owes, and what it all means. Whose Weekend Is It? is for the co-parent who is tired of renegotiating the same plan over and over. It separates the schedule from the conflict, shows how to write a swap rule before you need one, how to build backups for the disruptions you can predict, how to send a request that does not carry the whole history with it, and what to do when the answer is no. It does not promise the other parent will change, and it does not tell you what to do about the relationship. It promises that you will know what you are asking for, how to ask, and how to keep going when the plan bends. If your account raises a question of safety, this book says plainly that it is outside what a book can help with and points you to a domestic abuse service and to emergency services. It gives no legal or financial advice; it names the professional to ask.