It usually arrives as a text. "You're not having them this weekend." Or it's said at the door, with the kids behind her in the hallway, and you drive home with the car seats empty and your hands shaking on the wheel.
Then you type it into your phone at midnight. Can she actually do that?
The short version. In Australia there's no rule that says the kids are hers because she's the mother, and no rule that says you need her permission to be their father. Unless a court has made an order, or there's a family violence order in place, neither of you has more right to the kids than the other. But "she can't legally do that" and "there's nothing stopping her tonight" are both true at the same time, and that gap is where men do the most damage to themselves. The way back is not through her front door. It's through a mediator, and if that fails, a court. And it's usually quicker than you fear.
Now the long version.
What's actually true. The law here starts from the idea that children benefit from a relationship with both parents, as long as it's safe. Nobody has custody by default. If there's no order, she doesn't have a legal power to stop you; she just has the kids in her house. The same would be true in reverse. That matters, because it means you are not fighting to get something back. You're asking for something that was never taken from you on paper.
What's also true. You can't turn up and take them. You can't keep them at the end of a weekend because she kept them last time. You can't send the message that's sitting in your drafts. Every one of those feels like justice at 11pm and reads like a man losing it at 10am in front of someone whose job is to decide whether the kids are safe with you. The men who end up with the least time are very often the ones who were right, and acted on it.
What to do this week, in order. First, write it down. The date, what was said, how it was said, what you asked for, what you did. Boring, factual, no adjectives. Keep doing it. Second, ask in writing, calmly, for a specific arrangement: "I'd like to have the kids Wednesday nights and every second weekend, starting this Friday. Can we agree that?" Not a paragraph. Not the history. One ask. If she says no, you've now got a dated request and a dated refusal, and that's worth more than any argument. Third, call a Family Relationship Centre or a family mediator and book. Mediation (they call it family dispute resolution) is the step the court expects you to try before it'll hear you, and most arrangements get sorted there without a judge ever seeing your name. If she won't come, or it doesn't work, the mediator gives you a certificate (a section 60I certificate), and that's your ticket to court. Fourth, if you're being kept from the kids completely and mediation's going nowhere, a lawyer can ask the court for interim orders, which is the fast track for exactly this situation.
What not to do. Don't stop paying child support to make a point; it's a separate thing and the court will see it as punishing the kids. Don't message the kids about it, or ask them what she's saying. Don't post about it. Don't let a mate's brother talk you into "just going and getting them". And don't sign anything she or her lawyer sends you in the heat of it without someone reading it first.
If safety's been raised. If she's applied for a protection order, or says she's going to, everything above still applies but the order comes first. Obey it to the letter, even the bits that feel absurd, and get advice that day. Breaching it is the one thing that will cost you the kids for a long time.
The part nobody says. This is the week you'll be most tempted to make it a war, and it's the week that decides whether it becomes one. The man who writes things down, asks once in writing, and books the mediator comes out of this with his kids and his dignity. I've watched it go both ways. Go the boring way.
Where I'd go from here: how to prepare for family mediation, what a parenting plan is, and if you're not sure which stage you're in, six questions, two minutes.
None of this is legal advice; it's what I'd say to a mate at the kitchen table. Your situation has details I don't know. Legal Aid in your state, a Family Relationship Centre (1800 050 321) or a family lawyer can tell you what applies to you, and the first conversation is usually short. If tonight's a bad one: MensLine, 1300 78 99 78.
Alex