I need to know the password from this instagram account [he abused my little brother and has to hide something in his dms,etc]

https://www.instagram.com/sandu_.david/

@sandu_.david

his ip address : 82.77.10.141
his local ip: 192.168.0.103
Address: Romania,Suceava,Vadu Moldovei->Ciumulesti/Ganea
Phone number[Romania]:+40 774097083
Height: 1.75
Wears glasses, some bowl cut, skinny.