I have shared custody of my son. Last month my ex showed up with a guy to pick up my son.

"Well, third dude in 3 years he gets to meet. Nothing I can do except making up for her" I thought.

Fast forward a week, I get a letter from her lawyer asking to revise the parenting schedule from 3/4 days a week to week on/off. My spidey sense went off immediately.

I responded that I agreed but not to the weeks she wanted as it doesn't match my on call schedule at work.

Her lawyer responded that the schedule she wanted is best because he should be with his "step siblings". Bingo!! I thought

I told her lawyer that I didn't agree and asked her to book a day in court.

My ex responded to me freaking out asking why I can't do a favor for her and agree to "her schedule" (didn't mention my son). Gotcha bitch!

At this time I know that she's just trying to match the schedule with her new boyfriend so she can have time off with him. While throwing my son into a relationship with two kids he just met. I asked her what the plans are for him (housing, etc) and how long has he known them, but she has ignored me.

Everyone around me is telling me to tell her to go suck a dick. I don't want to sound in court like I'm a jealous jerk trying to hijack her relationship. Also I don't want to blow up all bridges because my family is very far and I need her cooperation to look after him if I have to travel for work or cover vacation.

What would you do?