So I've been with my partner just over a year now. All was well at the start but my partners parenting techniques is putting a strain on our relationship. His son (5) is very wild which ok is probably normal in children I don't have children of my own but I've had a big part in raising my niece (7) and nephew (3) and they're very well behaved and know manners. His son has to be reminded constantly about saying please and thank yous and not to snatch. He's currently going through a phase of not wanting proper food and screams the place down and refuses to eat (ofc his dad has to then cook other meals mainly fatty foods, sausages, chicken nuggets etc but when he's with his mom she says he eats whatever she's eating baked potatoes, fish pies, Sunday dinners etc. He also pretends to cry like ALOT to get his dad's attention over little things such as last night because he didn't have a basketball to play with, I told my partner to ignore his tantrums but he said he couldn't bring himself to do that. Low and behold today his dad has brought him a basketball! I told him that's not what you do as now he thinks he can get everything he wants by throwing tantrums. He's very cheeky and calls me stupid and I reply by telling him "I dont appreciate that" and that word should not be said in my home I then proceed to ignore him which helps a little but then after a day or two he starts again. I've also told his dad he needs to start doing educational things with him as he's too distracted and his school has said he needs extra support with his learning, my partner believes his son should do what makes him happy but when he plays up you can see the frustration in my partners face. I told him today he needs to parent differently to what he is now but it makes me feel awful having to tell him this.