If the termination grounds or hearing were raised subsequent to going out on disability, you may be able to assert a claim of retaliation as a violation of the FMLA or ADA. If your father is on long term disability, and not going back now, he may qualify for early retirement under the union pension plan's disability retirement benefits provision depending on how long he has been under the plan. Some plans allow for automatic vesting if retiring due to a disability, although the amounts are...