You should receive a 1099-R from the custodian of your father's 401k giving you the information you need to file this information on your 2017 return.  (The life insurance proceeds are not taxable, unless there is interest income, which is taxable.)

If you have not yet received it, be patient a few more days, as it was not required to be sent before 1/31/18.  Do not try to calculate or file your return without the 1099-R, and if you don't receive it by mid-February, you should call the custodian and inquire after it.

This income is reported on the Federal return Wages & Income tab.  Scroll down to Retirement Plans and Social Security, then Show more.  Start or Revisit Stocks, Mutual Funds, Bonds, Other and enter your 1099-R.

Please accept my condolences on the loss of your father.

edited [ 2.5.18 | 1:16 pm ]