can i put my share of my late fathers house in my younest childs name to stop my ex asking for more maintanince

If you are earning pounds, I wonder if you are in New York. Anyway, I'm not sure why your father's house is a consideration - inherited property is separate property in New York, like your dad's house. If it is generating rental income, then that might be income for purposes of child support etc. Maybe you can stop renting out the house and just use it as a second home? You should definitely see a lawyer because your case is probably too complicated to get advice on an internet forum. Good luck.