I have been with my partner for 2 years. I have a BD and he has 3 Bio kids. The problem is that he also has a SC that he is bringing up as his own. His 3 children are well rounded loving kids and I have built a strong bond with them. I thought my partner had done the same with my child also. However the step child is ruining my relationship. He is rude, has a nasty temper and is never grateful for what he has. He has the same spent on him as the other kids and is always asked what he wants for Xmas etc but within a day he is throwing tantrums because the others have something he wants!!