I have posted on here once before and I am now coming to ask you all for advice on step-parenting. I have an 8 yr old SS and I have been a mom to him for almost 5 years. His mom has not been in his life since before I came into the picture. I treat him like my own child but my in laws treat my first born different than SS and the 2 kids I have with their son-my husband. I have a problem that when I discipline him, he runs to call his grandma and mom to vent to them and then i'm looked at like i'm wrong or his grandma tells me I bet not touch him. He lives under our roof and I thought it would be a good thing to treat him as my own and not like an outcast like they do my DS. I have them on a set schedule when it comes to playing, dinner, shower and bed. Just tonight he went on his venting spree because I threatened to discipline them because I told them to come in the house to get ready for school in the morning and they ignored me and didn't come in until I went to get them when it was dark outside. All of a sudden, he don't want to eat the dinner I fixed and had on the table for them saying that he was tired and then goes in the bed and calls his mom back. My 2 other sons sleep in the same room and plus it's almost 8pm, it's bed time. I go in there and mention to him, I thought you were tired, he replies, i'm talking to my mom for a little bit!! I wanted to say I don't care. You know it's bed time but all I did was close the door. His mom did not call him on Thanksgiving, Christmas or New Years, now all of a sudden, you have to call her and have so much to say because I said I was going to discipline you. He only talks to his mom if he calls her. She does not send money to help, she does not send clothes or anything for him, she doesn't see him. She hasn't seen him since he turned 5. I just can't take me being a mother to him and not being able to assert my authority like I do to my own. My son knows and feels they treat him differently and tells me so and he just turned 5. Am I wrong to feel the way I feel?
P.S My husband and SS father said he would speak on it to them and talk to him but never has. He never sticks up for me or make me feel I have a say so. He let's them say and do what they want.