Answer:Sandman is a fugitive who is on the run. It is more than likely that his name has appeared in the news at some point. His daughter and her illness would likely have also been mentioned as well. Seeing as how Eddie worked at the Daily Bugle, it shouldn't have took long for him to put two and two together.
The symbiote (which turned Eddie into Venom) usually has its previous owner's memories. So Eddie might have known about Sandman's daughter through Peter's memories.
But Peter doesn't seem to know he had a daughter and shows surprise when he's told of her at the end.
Supposedly there is a deleted scene where Venom finds out about Sandman's daughter but it was cut for time, so it ends up creating a little bit of a plot hole in the final film.
Answer: Sandman is a fugitive who is on the run. It is more than likely that his name has appeared in the news at some point. His daughter and her illness would likely have also been mentioned as well. Seeing as how Eddie worked at the Daily Bugle, it shouldn't have took long for him to put two and two together.
Casual Person
The symbiote (which turned Eddie into Venom) usually has its previous owner's memories. So Eddie might have known about Sandman's daughter through Peter's memories.
But Peter doesn't seem to know he had a daughter and shows surprise when he's told of her at the end.
Rob245
Supposedly there is a deleted scene where Venom finds out about Sandman's daughter but it was cut for time, so it ends up creating a little bit of a plot hole in the final film.
Phaneron ★