I will suggest you visit a citizen advice bureau. Normally you are eligible to receive child benefit and possibly tax credit because he spends more time with you..
Keep receipts of items you buy for him even groceries. If correspondence regarding your son comes through your address, then you also have a good chance of proving it. Go through your chat with her you might find messages that signals towards him staying these number of nights. The citizen advice staff should be able to work with these proofs. Its her words against you .
You might also take loads of pictures & video recordings.
Thanks for advice . I have lots of picture’s evidence. Just December I have had him 19 nights . That’s an average.
From today I stop paying child maintenance. Also start collect all receipts from clothes. Usually I buy a lot.
I had enough to pay her for nothing and she’s got all the benefits. I don’t want benefits. But I’m not paying anymore. Specially if I don’t have to.
2 years I’m paying every month.
I’d like to have him full time but she’s never let me because of the benefits etc. She’s living a council house and she’s got lodger. Which is not aloud. And my son and step daughter and my ex sleeping in a same room same bed. Step daughter 10 years old. That’s not right . 🙁