Was round mums with Dsis and niece and nephew. They had all been playing nicely. Nephew then starts throwing tantrums because niece was playing on something and he wanted to even though he had a turn previously. He then stood in front of her and refused to move for her to continue playing. He then calmed down and was building a house. Dsis and niece then go upstairs. My Ds comes through and wanted to play a game which he was doing nicely. Nephew then announces he would like to play too. So they are both playing nicely and it involves turn taking and there are rules to the game obviously. Nephew didn't want to follow the rules which then made it unfair on my DS. I explained the rules again and nephew starts having a tantrum. My DM then steps in and excuses his bad behaviour and says to my DS "lets just let him play his rules". With my DS being a nice boy and not wanting to rock the boat he agrees. I bite my tongue as don't want to cause a scene in front of DS. Nephew continues his bad behaviour and now is sobbing in between his turn. We ask what is up. He won't answer us. He continues having multiple tantrums because my DS is playing by the actual rules but he plays by his. My DM then say's to my DS to leave playing the game so nephew can then play on his own. Nephews whimpering stops immediately and he is now happy because he is playing it on his own in his own way. So I speak up and say that it's not fair and what is that teaching DS and nephew. DM say's no it's not fair but there is nothing she can do. I say that it's not fair that my DS was playing it to begin with nicely and was playing nicely with nephew for him then to be kicked out of the game and nephew to play it on his own and getting what he wants. DM seems annoyed at me for speaking up. I then say that we are leaving. We put our shoes on and say goodbye. DM says bye to DS but not me and when I say bye to her she snaps BYE back at me.
For reference DS is 8, nephew is 5, niece is younger.
Niece and Dsis were upstairs whilst all this was going on and did not come downstairs.
I am so fed up of nephew always ruining things. His behaviour is rude and always has to be his way. It is always my DS who ends up conforming to what he wants or says "it's ok, don't worry" but I don't feel like it's ok and DS shouldn't think it is. DM is such an enabler of nephews behaviour and will make any excuse under the sun to say why he is behaving badly.
I was conditioned by my DM to be a people pleaser. I don't want her doing the same to DS and making feel like he has to say yes.