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You need to write to the manager of your SS and tell them what you intend to do and also what he did to you and which repercussions your plight of seeking justice has for your relationship with your own blood.
If necessary you also need to involve your local MP.
How is your health now?
Do you think you could take the kids back into your own care? You are in a relationship and have support.
Speak to Rights of Women about this!