you said you, your brother and your father use the same pc and the same internet which means it has the same IP address. their system detected the account of your father and brother and yours share the same IP address and considered the other two as an alt account and broke their ToS and resulting to your account being blocked/banned.
I said we use same pc on same freebitco.in account not mulri accounts and also on his list only my ip appear on my account i not see any multi ip he said.