It’s interesting how, in most of the cases where one child has been favoured over another, it is usually the son. Rarely do you hear the daughter being favoured when there is one son and one daughter!
Op, I feel your pain as similar happened to me. My feckless never-worked DB blackmailed my mum (she was told she’d never see him or his DC again if he didn’t get the money) to give him a lump sum as deposit to buy their house (his wife could get the mortgage, not via traditional ways).
I was not told of the deposit – so at least you are better off then me! Relatives knew of the money (though not how much) but were ordered to keep schtum. They have since told me they felt awful for me but didn’t know what to do.
Mum eventually blurted it out when ill (as I was managing her finances short term and had tackled her about monthly payments that she obviously sent to him). Her only response was “You never asked for anything…”
It was very hurtful, I always felt he was favoured and it just seem to prove it - plus the secrecy made things worse. I went NC for a while, but she was just diagnosed with a terminal illness and I couldn’t stay NC in her last months, for my own peace.
She did square things up at that point, knowing that she wouldn’t need long term care and was below IHT limit. However, the money felt tainted..…I would rather she changed her will to even things up but she refused.
I have since found out (from above relatives), that my DB wrote to her, ordering her to change her will and leave it all to him, when he was fuming at her for blurting their secret out. She didn’t, but until the minute that we actually sat with solicitor after her funeral, I expected him to pull a new will out of his pocket. He was (still is!) that deceitful.
I have made my peace with what happened, and most of the tainted money has been passed to my Young Adult DC, but am more or less NC with DB, and will never ever treat my own children in the same manner.
As someone else said, maybe writing a letter to them would help them understand how hurt you feel.
Also, please do not feel under any obligation to do the bulk of their care in future. Whilst I couldn’t go NC in her final year, I only did what was necessary, and made sure DB did his fair share too.