Sucking on hand 🙈

How have you all dealt with this? My daughter this past month just started going nuts on her hand and sucks on her fingers. like sticks multiple ones in at a time to suck them. We put her pacifier in her mouth but it's always out within seconds so she can suck on her hand. I was told to start with socks but she will also suck on her sleeves if they're too long so i think socks is a no go. The worst part is, my two year old just started sucking on his finger this week and i feel like there's a connection because he can sometimes be territorial. I need help!!! 😩