Definitely keep a journal about what is happening so you have evidence over a long term, not just relying on memory.
Also, I would talk to your DS before your ex. After all, he is the one doing the sport and he may prefer to change.
Why does your ex want full custody in the future and not now? Because he thinks children get easier to look after as they get older? I would try to concentrate on developing the best relationship I can with my kids and ignore ex as much as possible.
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