I hope nobody minds me gatecrashing this section, but I am really in need of some advice,although I am not living with my partner, or officially a stepmother. I am a widow with 3 children of my own and am in a relationship with a widower who has 2 children. We have known each other as friends for around 7 months and been in relationship for around 3 months. All the children seemed to get on well together until recently when my DS2 who is almost 13 started expressing his dislike for his DS2 who is almost 7. He is unkind to him and won't play with him when the two families get together, which tends to be around once a week as my friend and I meet without the children another day during the week. His behaviour was so unacceptable this weekend that I spoke to him severely, his older siblings and I believe that he is jealous and does not want to lose his position as the baby of the family. After previous bad behaviour I had already talked gently to him and encouraged him to express his feelings and reassured him that the love I felt for other people in no way diminished the love I felt for him or the place he had in my life.
He has been extremely difficult and argumentative lately over various issues like bedtime and personal hygiene. Tonight an argument over showers escalated into saying he wished my friend's DS2 would die. I was so shocked that I just sent him to his room to consider his behaviour, and he did seem sorry when he came down, but then had a complete meltdown over another issue. It is over 18 months since his father died and he is still having counselling once a fortnight at school. I am thinking it would be best to contact the school and discuss this with Pastoral Care. In the meantime does anyone have any advice on how they have dealt with similar problems, I am concerned, but am also very much in love with my new man and don't want this to spoil what we have. Am I right in thinking I shouldn't tell him what my son said about his DS?