I am single - without children
The selectable survivor’s covers (i.e. Family cover and Repayment cover) can only be used for spouse, “sambo” (see the next paragraph) or children. Since none of that applies to your situation, you don’t need a survivor’s cover.
Instead, you can make sure to receive a larger amount as your own pension.
The TGL part of your pension will automatically go to your ancestors. If you want someone else to have your TGL, you need to choose a Special beneficiary.
If you have ITP 2 and high salary, Family pension is included, but you should refrain from it, since it’s not relevant to your situation.