Law /
Relocation to Poland from UK & Relationship Breakdown (involving child) [7]
In one case he proved that she is a unfit mother as he hired a pvt detective and took videos of her partying out in clubs etc and some more and got full custody,the other one lasted for almost 3 years but he also did get full custody with visiting rights,which he also plays some game and dont let his kids see the mom(not good in my opinion but happens in strained relations).
I dont know the exact details as that is there personal business,and later one is a American attorney in Warsaw from New York partner in law firm for the last 20 years.
In the OP's case,looks he has substantial money and can hire a good attorney for full custody,until he dont want that serious responsibility.
I wonder if Poland has Palimony law,that she can ask him for alimony/palimony with child support.
Since you live in Warsaw,I wonder if you know what happened between the Polish actress Kasia Figura & kai,when they split?