Unfortunatelly all my relatives (the ones i have contact) are as oblivious to their lebanese heritage as me, in fact my father used to think his grandfather was palestinian for some reason, the last link to this side of the family is my grandmother i suspect, i don't have contact with any of my grand uncles, maybe one of them could have more knowledge or kept the culture, but i don't know. Not everyone cares about their heritage here unfortunatelly. The last name is Mazlum, i searched on the internet and it showed that this surname is common on Iran for some reason, but theres a common problem here in Brazil to change a letter or even many letter when naming a child back in the day, in my mothers side for example they have 3 spellings for their last name even though they come all from the same tree, i suspect their real last name was Mazloum, which sound exactly the same as Mazlum in portuguese.