Hi OP. I don’t know if you are still here but I have being lying awake half the night worrying about your 11 year old son and you.
Everyone one else has said it but please don’t put a little boy in this position. We expect a lot of our adolescent boys but they have a lot of emotional and mental development still to do. Imagine if we were talking about an 11 year old girl, and how vulnerable they would be.
You are the centre of your son’s world, his big brother is about to go to university, it sounds like his dad is mostly away, he needs his mum. He needs to know that you are always on his side, no matter what. Please don’t let this man whom you have only know for 18 months come between you.
However, I’m worried that 6 days out you are going to go ahead and do it anyway.
I really hope you think carefully about what has been said here and call it off but if your fiancé is going to stay in your life, please, for your son’s sake, book some Family counselling with Relate for all 4 of you and insist your fiancé does a positive parenting course. He won’t want to, but do it together so you can discuss what comes up. Please don’t leave your son alone with him until your fiancé has done the course. You might not want to spend the money but nothing is more important that your son’s well-being.
Make an urgent appointment for you and your son’s school counsellor before term ends so they know what’s going on and your son has somewhere to go and someone to talk to when things get difficult next term. You don’t say if he’s in Year 6 or 7 but if he’s moving school in September then he’s going to have even more to cope with, with his brother leaving home and his mum moving a new man in.
Please confide your concerns in your family and friends so they are ready to support you all through this when it gets difficult. Does your son have a good relationship with his grandparents, godparent or an aunty/uncle he can rely on?
Spend 10/15 mins with your son everyday, just the two of you doing something of his choice, and one evening per week, and one day per month, so he knows he can confide in you. Go for walks, or talk in the car side by side so it’s less awkward or confrontational.
Make sure your sons spend lots of 1:1 time together before your elder son goes to university. They are going to need each other. As an elder sibling who left a younger sibling in a difficult domestic situation when I went to uni, I still feel bad, but probably not as bad as he feels having lived through it.
I hope you’re ok.