ssdi auxiliary benefits back pay

I was approved disability in 2025, they put my date of receiving disability near the end of 2023. I received back pay, My children then received back pay at the same retro pay time of 2023. However on my ssa1099 it shows all of my back pay as well as my children’s. I have used the lump sum tab in the software, however it will not differentiate my children’s from mine and I am stuck having to pay taxes on the full amount. I’m not sure if this is correct or not, I had thought that I did not have to pay taxes on their retro pay. Any advice would be appreciated, thank you.

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