"A girl came up to them and told them that her Dad was deaf and was offended that they were signing to eachother because they were hearing."
The antecedent in this sentence isn't clear.
Is the meaning this?
"A girl came up to them and told them that her Dad was deaf and
he was offended that they were signing to each other because they were hearing."
Or was it this?
"A girl came up to them and told them that her Dad was deaf, and
she was offended that they were signing to each other because they were hearing."
Was the deaf father present? If not, how would he be offended?