My father had said several times he had around 50000 btc when he first heard about it a while ago, and I don't know if they are fake btc or something but I want to access the wallet(s).
-snip-
I found 3 folders: "Electrum-btcp" "Electrum" and "ElectronCash" and they are all empty,
Chances is, your father meant he has "
50000 BTCP".
Anyways, looking for his backup is still worth it.
And speaking of backup, any of those Electrum variants (
One for Bitcoin, two for Altcoins) requires a "
seed phrase"
to be written as backup before the user can finish creating his wallet.
So look for papers with words written on it (
12 words by default) which should be the seed phrase that can restore his wallets(s).
If you found it, get an offline PC, install Electrum and go restore it via "
Standard->I already have a seed" option.
Check the addresses (
View->Show Addresses) if any has balance.