My step son had problems

[deleted account] ( no moms have responded yet )

I have been with my partner for 3 years, we have a 4 month old Son together. I have a son from a previous relationship, as does he. My problem is, his son. Iv always had rules in my home, and they work, as i dont often have problems with my son (Im not saying he is perfect, far from it). My partner has his son from a Saturday morning through to Sunday 6pm. Worse time of my week.
He doesn't comply with my house rules (As my partner moved in with me). Just does what he wants, when he wants. I have tried very very hard to make things work with this child, but i cant, i feel the dread come over me on a Thursday/friday as i often wonder what kind off mood he will be in.
Im going to get too much into it, im just going to get straight to the problem point, he doesnt understand consequences.He wants everything his own way, he never wants to meet in the middle, and because my partner is only a weekend Father he tends to give in. But my son sees this as unfair, to which it is. The step child throws full on tantrums and he is nearly 8, cries all the time, causes problems at school and causes problems at home with him mother and his other siblings. His mum had done the calms program, and they say nothing is wrong, but clearly there is. His brothers from his mums house dont want to play with him because he just wants everything his own way. When he is naughty my partner will 'Ground' him, but yet lets him out again, how is this teaching him? I love my partner to bits, we have a beautiful son together but i dont like his other son, and yes i feel awful saying that, but believe me i have tried. This boy causes arguments most weekends, kicked me in the stomach while i was pregnant, so im finding it difficult to try with him.
He doesnt think before he speaks and i think its a problem, he calls me Mum, Miss or by my name. He calls his dad Mum, Miss then can go through names of his brothers (from his mums side). He is very immature for his age, wants kisses and cuddles all the time, wants to sit on his dads knee, he is 8 this month. Is that normal?

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