DP and I have been together just under a year, and for most of that time have had sole custody of DSD, DP's adopted daughter with her ex. DSD is now almost 9, DP became sole carer just over a year ago due to her ex's circumstances at the time. Her ex now claims to be back on his feet and has been pressing for more and more custody, though there have been issues with this due to him living several hours away. DP has suffered from health issues in the past year which are being addressed, her ex has tried to claim in the past these make DP unfit to look after DSD. These claims have been dismissed.
DP's ex is now talking about what is going to happen for Christmas this year. He has celebrated Christmas in the past, though is half from a non-Christian background. DSD is also of mixed ethnic and religious background, one being the same as ex's, but has celebrated Christmas in the past post adoption. DP's ex is now claiming that DSD should not be celebrating Christmas and wants custody of her between Christmas and New Year. He has already had her for Eid this year and there were concerns when she was returned that he was unfit to be looking after her, unfortunately due to little evidence nothing has been done about these.
AWBU to say no to this?