I didn’t misunderstand you. You wrote on previous page :
“My dads family comes from Northern Belarus and I don’t know if my great
grandparents look typical Belarusian, but I got told they look a bit
Finnic (which isn’t really surprising). “
In the past you mentioned you have a relative living in north-western Belarus having a surname common among Lipka Tatars. Where did you mention north-eastern Latvia?
PS There is no Finnic majority in north-eastern Latvia either.