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Hi, Sam here , one of the UK tax Experts here on Just Answer, thank you for your question and I shall reply shortly
I am afraid this cannot be backdated and a successful appeal made unless you had made the appropriate indication for you and your son and that the tax credit office then failed to make that adjustment. Its not up to the tax credit office to liaise with DWP or HMRC to establish what claims might already be in place, but up to you to make the appropriate claims elements on both the initial claim and subsequent annual reviews.
There is nothing hard about whether you had made the claims for the disability element as the forms clearly (as do the claim award notice) state these as a separate entity of entitlement
I am sorry the news is not better
I so agree with you and it would be far better if the system had always liaised with each of the regimes to ensure correct claims both in favour and with correct entitlements - this would ensure more accurate claims .
I am sorry this has not worked in your favour on this occasion