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Whether or not you can claim his pension depends on whether or not he left you as a named beneficiary of that pension plan. If he did not leave you as a named beneficiary, then it is possible the pension goes to his estate and will be distributed to all of his heirs. You would need to first contact the plan administrator at Amtrak to see about the plan description of his plan and whether or not he left any beneficiaries on his pension. If he did then that beneficiary gets his pension. If he did not then under IL law you must hire an attorney because you are the oldest child meaning there are multiple heirs and you must open his estate for probate to get the pension included to distribute to all of the heirs.
As far as his SS benefits, unless you were disabled before 20, you are not entitled as an heir or even oldest child to any benefits from his SS pension, but it is possible you are entitled to benefits from his Amtrak pension and that i who you need to contact first.
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