I'm just so sorry. You've had so many losses recently...all over the board.
You will get back with your baby brother somehow. I feel this. Until then, maybe you want to write him regular letters as if he's receiving them? Then, when you find him, you can give them to him and he'll know. It will help the both of you through this maybe? I'm sorry that your mother did that.
I'm just so sorry for your losses...
Many thoughts and prayers...
kd