16 year old moving in with dad

Hi i wonder if you could advise me pls.
Our daughter has decided to move in with her dad (gotta love teenagers). She moved in on January 1st this year and the new arrangement generally is 4 nights him, 3 nights me. However for school holidays (13 weeks per year) she will stay an extra night with me. In CMS language this means 208 nights with me (over 52 weeks) and 157 with him. CMS are saying "shared care" but he is denying the extra nights. They have said that they will give the benefit of the doubt to whoever claims child benefit (which we're also in dispute over). They also said the best thing to do is go to court and get a child arrangement order as they will take this as the holy grail. Is that really the only way to sort this? I imagine she'll be back before its sorted.

If daughter is staying with your ex for 4 nights for 39 weeks of the year and 3 nights for 13 weeks during the holidays it works out as 195 days with your ex and 170 with you.

What is the current arrangement for maintenance and what does your ex propose?

I assume your daughter is in year 11 at school. What are her plans beyond that?

Thank you for your reply. CMS worked it out as above based on number of nights so i'm a little confused about how you've worked it out sorry. CMS originally said that it was shared so no liability from either side but as my ex didn't agree with the extra night we are at a stalemate until they investigate further.

Yes she's in year 11 and will be going to college from Sept 24.

Thank you, i appreciate your help.

From what you posted your ex has 39 weeks x 4 nights (156) plus 13 weeks x 3 nights (39) TOTAL 195.

You therefore have 365-195 =170.

understood thank you.

I am still going down the shared responsibility route as I understand from CHB and CMS that it isn't just based on number of nights but other factors are taken into consideration. She has only been gone 3 weeks and she is already massively relying on me for day to day care and advice (which i knew would happen). I just hope that i can articulate that clearly enough.

I will also need to include his 2 week holiday that he takes every year when he leaves her with me.

Thanks again