Parent of a British Child Info

Hello. I am new here but looking forward to any and all advice. I will be applying for a parent of a British child visa in the next month or so. My ex is supporting this choice and ready to write a letter to support that. My question is, does anyone have an example or something like that for this letter? I would love to hear any other advice or stories on this type of application as well. Thank you to everyone!

Hi,
I switched from a spouse visa to a parent one I applied last month so that letter of my ex says that our daughter will be living with me the mother and he would visit her over the weekends and so on the thing is he has to validate that the child lives with you and you are either the main carer the one the child lives with or present in the child life so an example of what you do with your child l, as well get a letter from the school that you attend parent meetings and events with your child.