But adopting a sibling is a criteria for getting adoption allowance from the LA.
I know, because I can read here, that my opinion is not the majority, that it's not a great injustice that there isn't an adoption equivalent of maternity allowance. To my mind, there are pros and cons of being self employed, the lack of holiday pay, sick pay, and adoption pay are cons, and have to be factored in to the employed vs self employed decision making, as there are real pros to it. If you want statutory adoption pay, there is always the option of getting employed at the start of the process, as by the time of placement, you'd worked the required time. It's not like pregnancy, where it can happen just as you change employer, or out of the blue.
The fact that women get a small amount of MA for the end of pregnancy/recovering from pregnancy, is different to a planned event like adoption, where your finances are assessed. If you 'fall' into adoption, there is right to request an adoption allowance, and for siblings that should be looked at. In my view, MA isn't for the child, it's for the woman, and adoption is a more equitable process than pregnancy and birth, and more planned.
But, as I said, I can tell that my opinion is different to everyone else's here.